Many modern text editors automatically check the spelling of the user's text. Some editors even suggest how to correct typos.

In this problem your task to implement a small functionality to correct two types of typos in a word. We will assume that three identical letters together is a typo (for example, word "helllo" contains a typo). Besides, a couple of identical letters immediately followed by another couple of identical letters is a typo too (for example, words "helloo" and "wwaatt" contain typos).

Write a code that deletes the minimum number of letters from a word, correcting described typos in the word. You are allowed to delete letters from both ends and from the middle of the word.

Input

The single line of the input contains word s, its length is from 1 to 200000 characters. The given word s consists of lowercase English letters.

Output

Print such word t that it doesn't contain any typos described in the problem statement and is obtained from s by deleting the least number of letters.

If there are multiple solutions, print any of them.

Examples

Input

helloo


Output

hello


Input

woooooow


Output

woow

Note

The second valid answer to the test from the statement is "heloo".
import java.io.*;
import java.math.*;
import java.util.*;


/**
 *
 * @author Saju
 *
 */

public class Main {

	private static int dx[] = { 1, 0, -1, 0 };
	private static int dy[] = { 0, -1, 0, 1 };

	private static final long INF = Long.MAX_VALUE;
	private static final int INT_INF = Integer.MAX_VALUE;
	private static final long NEG_INF = Long.MIN_VALUE;
	private static final int NEG_INT_INF = Integer.MIN_VALUE;
	private static final double EPSILON = 1e-10;

	private static final int MAX = 107;
	
	private static final long MOD = 1000000007;

	private static final int MAXN = 10000007;
	private static final int MAXA = 10000009;
	private static final int MAXLOG = 22;

	public static void main(String[] args) throws IOException {

		InputReader in = new InputReader(System.in);
		PrintWriter out = new PrintWriter(System.out);

//		 InputReader in = new InputReader(new FileInputStream("src/test.in"));
//		 PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter("src/test.out")));



/*



*/
		
		String str = in.next();
		StringBuilder sb = new StringBuilder();
		sb.append(str);
		for(int i = 0; i < sb.length(); i++) {
			int j = i + 1;
			int c = 1;
			while(j < sb.length() && sb.charAt(i) == sb.charAt(j)) {
				c++;
				j++;
			}
			if(c >= 3) {
				sb.replace(i + 1, j - 1, "");
			}
		}
		
		for(int i = 0; i < sb.length(); i++) {
			if(i + 3 < sb.length()) {
				if(sb.charAt(i) == sb.charAt(i + 1) && sb.charAt(i + 2) == sb.charAt(i + 3)) {
					sb.replace(i + 3, i + 4, "");
					i = i + 2;
				}
			}
		}
		out.println(sb.toString());
		
		
		out.flush();
		out.close();
		System.exit(0);
	}
	
	
	
	private static int ceil(int n, int x) {
		int div = n / x;
		if(div * x != n) {
			div++;
		}
		return div;
	}

	private static class Point {
		double x;
		double y;

		Point(double x, double y) {
			this.x = x;
			this.y = y;
		}

		double getDistance(Point p2) {
			Point p1 = this;
			double dx = p1.x - p2.x;
			double dy = p1.y - p2.y;

			return Math.sqrt((dx * dx) + (dy * dy));
		}
	}

	private static int abs(int x) {
		if (x < 0) {
			return -x;
		}
		return x;
	}

	private static long abs(long x) {
		if(x < 0) {
			return -x;
		}
		return x;
	}

	private static int lcm(int a, int b) {
		return (a * b) / gcd(a, b);
	}

	private static int gcd(int a, int b) {
		if (a == 0)
			return b;
		return gcd(b % a, a);
	}

	private static int log(long x, int base) {
		return (int) (Math.log(x) / Math.log(base));
	}

	private static long min(long a, long b) {
		if (a < b) {
			return a;
		}
		return b;
	}

	private static int min(int a, int b) {
		if (a < b) {
			return a;
		}
		return b;
	}

	private static long max(long a, long b) {
		if (a < b) {
			return b;
		}
		return a;
	}

	private static int max(int a, int b) {
		if (a < b) {
			return b;
		}
		return a;
	}

	private static class InputReader {
		public BufferedReader reader;
		public StringTokenizer tokenizer;

		public InputReader(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream));
			tokenizer = null;
		}

		public String next() {
			try {
				while (tokenizer == null || !tokenizer.hasMoreTokens()) {
					tokenizer = new StringTokenizer(reader.readLine());

				}
			} catch (IOException e) {
				return null;
			}
			return tokenizer.nextToken();
		}

		public String nextLine() {
			String line = null;
			try {
				tokenizer = null;
				line = reader.readLine();
			} catch (IOException e) {
				throw new RuntimeException(e);
			}
			return line;
		}

		public int nextInt() {
			return Integer.parseInt(next());
		}

		public double nextDouble() {
			return Double.parseDouble(next());
		}

		public long nextLong() {
			return Long.parseLong(next());
		}

		public boolean hasNext() {
			try {
				while (tokenizer == null || !tokenizer.hasMoreTokens()) {
					tokenizer = new StringTokenizer(reader.readLine());
				}
			} catch (Exception e) {
				return false;
			}
			return true;
		}
	}
}