Petya has n positive integers a1, a2, ..., an. 

His friend Vasya decided to joke and replaced all digits in Petya's numbers with a letters. He used the lowercase letters of the Latin alphabet from 'a' to 'j' and replaced all digits 0 with one letter, all digits 1 with another letter and so on. For any two different digits Vasya used distinct letters from 'a' to 'j'.

Your task is to restore Petya's numbers. The restored numbers should be positive integers without leading zeros. Since there can be multiple ways to do it, determine the minimum possible sum of all Petya's numbers after the restoration. It is guaranteed that before Vasya's joke all Petya's numbers did not have leading zeros.

Input

The first line contains a single integer n (1 ≤ n ≤ 1 000) — the number of Petya's numbers.

Each of the following lines contains non-empty string si consisting of lowercase Latin letters from 'a' to 'j' — the Petya's numbers after Vasya's joke. The length of each string does not exceed six characters.

Output

Determine the minimum sum of all Petya's numbers after the restoration. The restored numbers should be positive integers without leading zeros. It is guaranteed that the correct restore (without leading zeros) exists for all given tests.

Examples

Input

3
ab
de
aj


Output

47


Input

5
abcdef
ghij
bdef
accbd
g


Output

136542


Input

3
aa
jj
aa


Output

44

Note

In the first example, you need to replace the letter 'a' with the digit 1, the letter 'b' with the digit 0, the letter 'd' with the digit 2, the letter 'e' with the digit 3, and the letter 'j' with the digit 4. So after the restoration numbers will look like [10, 23, 14]. The sum of them is equal to 47, which is the minimum possible sum of the numbers after the correct restoration.

In the second example the numbers after the restoration can look like: [120468, 3579, 2468, 10024, 3]. 

In the second example the numbers after the restoration can look like: [11, 22, 11]. 
	import java.io.*;
	import java.math.BigInteger;
	import java.util.*;
	
	import javax.sound.midi.Synthesizer;

	
	
	public class Main
	{
		private InputStream is;
		private PrintWriter out;
		int time = 0, freq[], start[], end[], dist[], black[], MOD = (int) (1e9 + 7), arr[], weight[][], x[], y[], parent[];
		int MAX = 1000001, N, K;
		long red[], ans = Long.MAX_VALUE;
	
		ArrayList<Integer>[] amp;
		ArrayList<Pair>[] pmp;
		boolean b[];
		boolean boo[][], b1[];
		Pair prr[];
		HashMap<Pair, Integer> hm = new HashMap();
		int Dp[][] = new int[1100][1100];
	
		void soln() 
		{
			is = System.in;
			out = new PrintWriter(System.out);
			long s = System.currentTimeMillis();
			solve();
	
			// out.close();
			out.flush();
			// tr(System.currentTimeMillis() - s + "ms");
		}
		
		 class ST1 // min ST
		{
			int arr[], st[];
			int size;
	
			ST1(int a[]) {
				arr = a.clone();
				size = 10 * arr.length;
				st = new int[size];
				build(0, arr.length - 1, 1);
			}
	
			void build(int ss, int se, int si) {
				if (ss == se) {
					st[si] = arr[ss];
					return;
				}
				int mid = (ss + se) / 2;
				int val = 2 * si;
				build(ss, mid, val);
				build(mid + 1, se, val + 1);
				st[si] = gcd(st[val], st[val + 1]);
			}
	
			/*void update(int ss, int se, int idx, long val, int si) {
				if (ss == se) {
					// if(si==idx+1)
					st[si] = val;
					return;
				}
				int mid = (ss + se) / 2;
				if (ss <= idx && idx <= mid) {
					update(ss, mid, idx, val, 2 * si);
				} else {
					update(mid + 1, se, idx, val, 2 * si + 1);
				}
				int v = 2 * si;
				st[si] = Math.min(st[v], st[v + 1]);
			}*/
	
			int get(int ss, int se, int l, int r, int si) {
				if (l > se || r < ss || l > r)
					return 0;
				if (l <= ss && r >= se)
					return st[si];
				int mid = (ss + se) / 2;
				int val = 2 * si;
				return gcd(get(ss, mid, l, r, val), get(mid + 1, se, l, r, val + 1));
			}
		}
	
		public static void main(String[] args) throws Exception
		{
			new Thread(null, new Runnable() 
			{
				public void run() 
				{
					try 
					{
						// new Main().soln();
					} catch (Exception e) 
					{
						System.out.println(e);
					}
				}
			}, "1", 1 << 26).start();
			new Main().soln();
		}
	
		int D[][];
		char ch[][], ch1[];
		int hash = 29;
		int x2, y2;
		HashSet<Integer>[] hs = (HashSet<Integer>[]) new HashSet[110];
		cell[] c;
		 boolean ar[] = new boolean[1000];
		Pair[] p = new Pair[4];
		 int a1[] = new int[7];
		 int a2[] = new int[7];
		 int a3[] = new int[7];
		 int a4[] = new int[7];
		 private static class Comp implements Comparable<Comp>{
				int ind;
				BigInteger v;

				@Override
				public int compareTo(Comp arg0) {
					if(v==arg0.v)
						return this.ind-arg0.ind;
					return this.v.compareTo(arg0.v);
				}
			}
		 private static class Comp1 implements Comparable<Comp1>{
				int ind;
				String v;

				@Override
				public int compareTo(Comp1 arg0) {
					if(v.equals(arg0.v))
						return this.ind-arg0.ind;
					return this.v.compareTo(arg0.v);
				}
			}
		 void solve()
		 {
			int n = ni();
			String str[] = new String[n];
			for(int i = 0; i< n; i++) {
				str[i] = ns();
			}
			int fix[] = new int[200];
			boolean b[] = new boolean[200];
			long val[] = new long[200];
			int pow[] = {1,10,100,1000,10000,100000};
			for(int i = 0; i< n; i++) {
				int g = str[i].length()-1;
				b[str[i].charAt(0)] = true;
				for(int j = 0; j<=g;j++) {
					val[str[i].charAt(j)] += pow[g-j];
				}
			}
			//for(int i = 'a';i<='j';i++) System.out.println(val[i]);
			boolean cool = true;
			int ans = 1;
			for(int c = 0;c<10;c++) {
				long max = 0;
				int aa = -1;
				for(int i = 'a';i<='j';i++) {
					if(val[i]>max) {
						max = val[i];
						aa = i;
					}
				}
				if(aa!=-1) {
					if(b[aa] || !cool) {
						fix[aa] = ans++;
					}
					else{
						fix[aa] = 0;
						cool = false;
					}
					val[aa] = -1;
				}
				else break;
			}
			long fa = 0;
			for(String s : str) {
				StringBuilder sb = new StringBuilder();
				for(char c : s.toCharArray()) {
					sb.append(fix[c]);
				}
				fa += Integer.parseInt(sb.toString());
			}
			System.out.println(fa);
		 }
		 void dfs(int v, int col) {
			 if(col!=arr[v]) {
				 ans++;
				 col = arr[v];
			 }
			 for(int i : amp[v]) {
				 dfs(i,col);
			 }
		 }
		 String check(String[] s) {
			 char ch[] = new char[] {'a','a','a','a'};
			 boolean b = false;
			 for(int i = 0;i<4;i++) {
				 if(i>0) {
					 if(ch[i]=='a') continue;
				 }
				 for(int j = i+1;j<4;j++) {
					 if(!s[i].equals(s[j])) {
						 if(ch[i] == 'a' && ch[j]=='a') ch[j] = 'b';
						 else if(ch[j]=='a') continue;
						 else {
							 System.out.println("NO");
							 System.exit(0);
						 }
					 }
					 else b = true;
				 }
			 }
			 return new String(ch);
		 }
		 boolean isVowel(char c) {
			 if(c=='a' || c=='e' ||c=='i' ||c=='o' ||c=='u' ) return true;
					 return false;
		 }
		 void recur1(int[] a1, int[] a2) {
			 for(int i = 1; i< 7;i++) {
				 for(int j = 1; j< 7;j++) {
					 ar[a1[i]*10+a2[j]] = true;
					 ar[a2[j]*10+a1[i]] = true;
				 }
			 }
		 }
		 int dfs(int x) {
			 b[x] = true;
			 for(int i : amp[x]) {
				 if(!b[i]) {
					 dist[i] = dist[x]+1;
					 arr[x] += dfs(i);
				 }
			 }
			 return ++arr[x];
		 }
		boolean binaryS(int a, int b, int c, int d) {
			double l = 0, r = 90;
			for(int count = 0;count<=300;count++)
			{
				double mid = (l + r) / 2;
				double temp = mid * Math.PI / 180;
				double x1 = Math.cos(temp) * c;
				double x2 = Math.sin(temp) * c;
				temp = Math.PI / 2 - temp;
				double y1 = Math.cos(temp) * d;
				double y2 = Math.sin(temp) * d;
				if ((x1 + y1 <= a) && (x2 + y2 <= b)) return true;
				else if (x1 + y1 > a) l = mid;
				else r = mid;
			}
			return false;
		}
		/*void bfs(int s, int n) {
			b = new boolean[n];
			dist = new int[n];
			Arrays.fill(dist, 1000000);
			dist[s] = 0;
			b[s] = true;
			Queue<Integer> q = new LinkedList<>();
			q.add(s);
			while(!q.isEmpty()) {
				int y = q.poll();
				for(int i : amp[y]) {
					dist[i] = min(dist[i],dist[y]+1);
					if(!b[i]) {
						b[i] = true;
						q.add(i);
					}
				}
			}
		}*/
		boolean check(String s, String s1) {
			char ch1[] = s.toCharArray(), ch2[] = s1.toCharArray();
			int arr[] = new int[10];
			for(char c : ch1) {
				arr[c-'0']++;
			}
			int ans = 0;
			for(char c:ch2) {
				arr[c-'0']--;
			}
			
			for(int i:arr) ans += ((i>0)?i:0);
			return ans==3;
		}
		void seive(int n)
		{
			start = new int[n];
			for(int i = 2;i<n;i++) {
				if(start[i]==0) {
					for(int j = 2*i;j<n;j+=i) {
						start[j] = i;
					}
				}
			}
		}
		void print(int[][] arr) 
		{
			int seed = 110, n = arr.length - 220;
			for (int i = 0; i < n; i++) {
				for (int j = 0; j < n; j++) {
					System.out.print(arr[i + seed][j + seed] + " ");
				}
				System.out.println();
			}
			System.out.println();
		}
	
		 class cell implements Comparable<cell>
		 {
			int s, d, p, i;
	
			cell(int t, int d, int p, int i) {
				this.s = t;
				this.p = p;
				this.d = d;
				this.i = i;
			}
	
			public int compareTo(cell other) {
				// return Integer.compare(val, other.val);
				return Long.compare(d, other.d) != 0 ? (Long.compare(d, other.d)): (Long.compare(i,other.i));
												// other.v));//((Long.compare(u, other.u) != 0 ? (Long.compare(u, other.u)):
												// (Long.compare(v, other.v)))
				// &(Long.compare(u, other.v) != 0 ? (Long.compare(u, other.v)):
				// (Long.compare(v, other.u))));
			}
	
			public String toString() {
				return this.d + " " + this.s +" "+this.p+" "+this.i;
			}
		}
	
		int abs(int x)
		{
			return ((x > 0) ? x : -x);
		}
	
		long ret(int p) 
		{
			if (p >= 0)
				return 0;
			else
				return 1;
		}
	
		long val(int p, int a, int b) 
		{
			if (p >= 0) {
				return (a * 1l * p);
			}
			return (b * 1l * p);
		}
	
		
	
	
		public int getParent(int x) 
		{
			while (parent[x] != x) {
				parent[x] = parent[parent[x]];
				x = parent[x];
			}
			return x;
		}
	
		void getFactors(int n, int x)
		{
			for (int i = 1; i * i <= n; i++) {
				if (n % i == 0) {
					hs[x].add(i);
					hs[x].add(n / i);
				}
			}
		}
	
		void recur(int a, int b, int k) 
		{
			if (k == 0) {
				if (a == x2 && b == y2)
					ans++;
				return;
			}
			recur(a, b + 1, k - 1);
			recur(a, b - 1, k - 1);
			recur(a + 1, b, k - 1);
			recur(a - 1, b, k - 1);
		}
	
		int min(int a, int b) 
		{
			return (a < b) ? a : b;
		}
	
		/*private class Cell implements Comparable<Cell> {
			int u, v, s;
	
			public Cell(int u, int v, int s) {
				this.u = u;
				this.v = v;
				this.s = s;
			}
	
			public int hashCode() {
				return Objects.hash();
			}
	
			public int compareTo(Cell other) {
				return (Long.compare(s, other.s) != 0 ? (Long.compare(s, other.s))
						: (Long.compare(v, other.v) != 0 ? Long.compare(v, other.v) : Long.compare(u, other.u)))
						& ((Long.compare(s, other.s) != 0 ? (Long.compare(s, other.s))
								: (Long.compare(u, other.v) != 0 ? Long.compare(u, other.v) : Long.compare(v, other.u))));
			}
	
			public String toString() {
				return this.u + " " + this.v;
			}
		}*/

		
		class Pair implements Comparable<Pair>
		{
			int u ,v,i;
	
			Pair(int u, int v) {
				this.u = u;
				this.i = v;
			}
	
			Pair(int u, int v, int i) {
				this.u = u;
				this.v = v;
				this.i = i;
			}
	
			public int hashCode() {
				return Objects.hash();
			}
	
			public boolean equals(Object o) {
				Pair other = (Pair) o;
				return ((u == other.u && v == other.v));
			}
	
			public int compareTo(Pair other) {
				// return Integer.compare(val, other.val);
				return Long.compare(u, other.u) != 0 ? (Long.compare(u, other.u)) : (Long.compare(i, other.i));// ((Long.compare(u,
			
			}									
			public String toString() {
				return this.u + " " + this.v +" "+this.i;
			}
		}
	
		long max(long a, long b) 
		{
			if (a > b)
				return a;
			return b;
		}
	
		static class FenwickTree 
		{
	
			int[] array; // 1-indexed array, In this array We save cumulative
							// information to perform efficient range queries and
							// updates
	
			public FenwickTree(int size) {
				array = new int[size + 1];
			}
	
			public int rsq(int ind) {
				assert ind > 0;
				int sum = 0;
				while (ind > 0) {
					sum += array[ind];
					// Extracting the portion up to the first significant one of the
					// binary representation of 'ind' and decrementing ind by that
					// number
					ind -= ind & (-ind);
				}
				return sum;
			}
	
			public int rsq(int a, int b) {
				assert b >= a && a > 0 && b > 0;
				return rsq(b) - rsq(a - 1);
			}
	
			public void update(int ind, int value) {
				assert ind > 0;
				while (ind < array.length) {
					array[ind] += value;
					// Extracting the portion up to the first significant one of the
					// binary representation of 'ind' and incrementing ind by that
					// number
					ind += ind & (-ind);
				}
			}
	
			public int size() {
				return array.length - 1;
			}
		}
		void buildGraph(int n)
		{
			for (int i = 0; i < n; i++) {
				int x1 = ni(), y1 = ni();
				amp[x1-1].add(y1-1);
				amp[y1-1].add(x1-1);
			}
		}
		long modInverse(long a, long mOD2)
		{
			return power(a, mOD2 - 2, mOD2);
		}
	
		long power(long x, long y, long m) 
		{
			if (y == 0)
				return 1;
			long p = power(x, y / 2, m) % m;
			p = (p * p) % m;
	
			return (y % 2 == 0) ? p : (x * p) % m;
		}
	
		public int gcd(int a, int b)
		{
			if (b == 0)
				return a;
			return gcd(b, a % b);
		}
	
		/*static class ST
		{
			int arr[], lazy[], n;
	
			ST(int a) {
				n = a;
				arr = new int[10 * n];
				lazy = new int[10 * n];
			}
	
			void up(int l, int r, int val) {
				update(0, n - 1, 0, l, r, val);
			}
	
			void update(int l, int r, int c, int x, int y, int val) {
				if (lazy[c] != 0) {
					lazy[2 * c + 1] += lazy[c];
					lazy[2 * c + 2] += lazy[c];
					if (l == r)
						arr[c] += lazy[c];
					lazy[c] = 0;
				}
				if (l > r || x > y || l > y || x > r)
					return;
				if (x <= l && y >= r)
	
				{
					lazy[c] += val;
					return;
				}
				int mid = l + r >> 1;
				update(l, mid, 2 * c + 1, x, y, val);
				update(mid + 1, r, 2 * c + 2, x, y, val);
				arr[c] = Math.max(arr[2 * c + 1], arr[2 * c + 2]);
			}
	
			int an(int ind) {
				return ans(0, n - 1, 0, ind);
			}
	
			int ans(int l, int r, int c, int ind) {
				if (lazy[c] != 0) {
					lazy[2 * c + 1] += lazy[c];
					lazy[2 * c + 2] += lazy[c];
					if (l == r)
						arr[c] += lazy[c];
					lazy[c] = 0;
				}
				if (l == r)
					return arr[c];
				int mid = l + r >> 1;
				if (mid >= ind)
					return ans(l, mid, 2 * c + 1, ind);
				return ans(mid + 1, r, 2 * c + 2, ind);
			}
		}*/
	
		public static int[] shuffle(int[] a, Random gen)
		{
			for (int i = 0, n = a.length; i < n; i++) {
				int ind = gen.nextInt(n - i) + i;
				int d = a[i];
				a[i] = a[ind];
				a[ind] = d;
			}
			return a;
		}
	
		long power(long x, long y, int mod)
		{
			long ans = 1;
			while (y > 0) {
				if (y % 2 == 0) {
					x = (x * x) % mod;
					y /= 2;
				} else {
					ans = (x * ans) % mod;
					y--;
				}
			}
			return ans;
		}
	
		// To Get Input
		// Some Buffer Methods
		private byte[] inbuf = new byte[1024];
		public int lenbuf = 0, ptrbuf = 0;
	
		private int readByte() 
		{
			if (lenbuf == -1)
				throw new InputMismatchException();
			if (ptrbuf >= lenbuf) {
				ptrbuf = 0;
				try {
					lenbuf = is.read(inbuf);
				} catch (IOException e) {
					throw new InputMismatchException();
				}
				if (lenbuf <= 0)
					return -1;
			}
			return inbuf[ptrbuf++];
		}
	
		private boolean isSpaceChar(int c) {
			return !(c >= 33 && c <= 126);
		}
	
		private int skip() {
			int b;
			while ((b = readByte()) != -1 && isSpaceChar(b))
				;
			return b;
		}
	
		private double nd() {
			return Double.parseDouble(ns());
		}
	
		private char nc() {
			return (char) skip();
		}
	
		private String ns() {
			int b = skip();
			StringBuilder sb = new StringBuilder();
			while (!(isSpaceChar(b) && b!=' ')) { // when nextLine, (isSpaceChar(b) && b != '
										// ')
				sb.appendCodePoint(b);
				b = readByte();
			}
			return sb.toString();
		}
	
		private char[] ns(int n) {
			char[] buf = new char[n];
			int b = skip(), p = 0;
			while (p < n && !(isSpaceChar(b))) {
				buf[p++] = (char) b;
				b = readByte();
			}
			return n == p ? buf : Arrays.copyOf(buf, p);
		}
	
		private char[][] nm(int n, int m) {
			char[][] map = new char[n][];
			for (int i = 0; i < n; i++)
				map[i] = ns(m);
			return map;
		}
	
		private int[] na(int n) {
			int[] a = new int[n];
			for (int i = 0; i < n; i++)
				a[i] = ni();
			return a;
		}
	
		private int ni() {
			int num = 0, b;
			boolean minus = false;
			while ((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'))
				;
			if (b == '-') {
				minus = true;
				b = readByte();
			}
	
			while (true) {
				if (b >= '0' && b <= '9') {
					num = num * 10 + (b - '0');
				} else {
					return minus ? -num : num;
				}
				b = readByte();
			}
		}
	
		private long nl() {
			long num = 0;
			int b;
			boolean minus = false;
			while ((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'))
				;
			if (b == '-') {
				minus = true;
				b = readByte();
			}
	
			while (true) {
				if (b >= '0' && b <= '9') {
					num = num * 10 + (b - '0');
				} else {
					return minus ? -num : num;
				}
				b = readByte();
			}
		}
	
		private boolean oj = System.getProperty("ONLINE_JUDGE") != null;
	
		private void tr(Object... o) {
			if (!oj)
				System.out.println(Arrays.deepToString(o));
		}
	}