You've gotten an n × m sheet of squared paper. Some of its squares are painted. Let's mark the set of all painted squares as A. Set A is connected. Your task is to find the minimum number of squares that we can delete from set A to make it not connected.

A set of painted squares is called connected, if for every two squares a and b from this set there is a sequence of squares from the set, beginning in a and ending in b, such that in this sequence any square, except for the last one, shares a common side with the square that follows next in the sequence. An empty set and a set consisting of exactly one square are connected by definition.

Input

The first input line contains two space-separated integers n and m (1 ≤ n, m ≤ 50) — the sizes of the sheet of paper. 

Each of the next n lines contains m characters — the description of the sheet of paper: the j-th character of the i-th line equals either "#", if the corresponding square is painted (belongs to set A), or equals "." if the corresponding square is not painted (does not belong to set A). It is guaranteed that the set of all painted squares A is connected and isn't empty.

Output

On the first line print the minimum number of squares that need to be deleted to make set A not connected. If it is impossible, print -1. 

Examples

Input

5 4
####
#..#
#..#
#..#
####


Output

2


Input

5 5
#####
#...#
#####
#...#
#####


Output

2

Note

In the first sample you can delete any two squares that do not share a side. After that the set of painted squares is not connected anymore.

The note to the second sample is shown on the figure below. To the left there is a picture of the initial set of squares. To the right there is a set with deleted squares. The deleted squares are marked with crosses. 

<image>

import java.io.*;
import java.math.*;
import java.util.*;

import static java.util.Arrays.fill;
import static java.lang.Math.*;
import static java.util.Arrays.sort;
import static java.util.Collections.sort;


public class A193 
{

	public static int mod = 1000000007;
	public static long INF = (1L << 60);
	static FastScanner2 in = new FastScanner2();
	static OutputWriter out = new OutputWriter(System.out);
	static int n,m;
	static char[][] mat;
	static boolean[][] visited;
	static int[] dx={0,0,-1,1};
	static int[] dy={-1,1,0,0};
	public static boolean isvalid(int r,int c)
	{
		return r>=0 && c>=0 && r<n && c<m;
	}
	public static void dfs(int r,int c)
	{
		visited[r][c]=true;
		for(int i=0;i<4;i++)
		{
			if(isvalid(r+dx[i], c+dy[i]) && !visited[r+dx[i]][c+dy[i]] && mat[r+dx[i]][c+dy[i]]=='#')
			{
				dfs(r+dx[i], c+dy[i]);
			}
		}
	}
	public static void main(String[] args) 
	{

		n=in.nextInt();
		m=in.nextInt();
		mat=new char[n][m];
		visited=new boolean[n][m];
		int count=0;
		for(int i=0;i<n;i++)
		{
			String s=in.nextLine();
			for(int j=0;j<m;j++)
			{
				mat[i][j]=s.charAt(j);
				if(mat[i][j]=='#')
					count++;
			}
		}
		if(count<=2)
		{
			System.out.println(-1);
			return;
		}
		for(int i=0;i<n;i++)
		{
			for(int j=0;j<m;j++)
			{
				if(mat[i][j]=='#')
				{
					dfs(i, j);
					for(int ii=0;ii<n;ii++)
					{
						for(int jj=0;jj<m;jj++)
						{
							if(mat[ii][jj]=='#' && !visited[ii][jj])
							{
								System.out.println(0);
								return;
							}
							visited[ii][jj]=false;
						}
					}
				}
			}
		}
		for(int i=0;i<n;i++)
		{
			for(int j=0;j<m;j++)
			{
				if(mat[i][j]=='#')
				{
					mat[i][j]='.';
					boolean tobreak=false;
					for(int ii=0;ii<n;ii++)
					{
						for(int jj=0;jj<m;jj++)
						{
							if(mat[ii][jj]=='#')
							{
								dfs(ii, jj);
								tobreak=true;
								break;
							}
						}
						if(tobreak)
							break;
					}
					for(int ii=0;ii<n;ii++)
					{
						for(int jj=0;jj<m;jj++)
						{
							if(mat[ii][jj]=='#' && !visited[ii][jj])
							{
								System.out.println(1);
								return;
							}
							visited[ii][jj]=false;
						}
					}
					mat[i][j]='#';
				}
			}
		}
		out.println(2);
		out.close();

	}
	
	public static long pow(long x, long n) 
	{
		long res = 1;
		for (long p = x; n > 0; n >>= 1, p = (p * p)) 
		{
			if ((n & 1) != 0) 
			{
				res = (res * p);
			}
		}
		return res;
	}
	
	public static long pow(long x, long n, long mod) 
	{
		long res = 1;
		for (long p = x; n > 0; n >>= 1, p = (p * p) % mod) 
		{
			if ((n & 1) != 0) 
			{
				res = (res * p % mod);
			}
		}
		return res;
	}

	public static long gcd(long n1, long n2)
	{
		long r;
		while (n2 != 0) 
		{
			r = n1 % n2;
			n1 = n2;
			n2 = r;
		}
		return n1;
	}

	public static long lcm(long n1, long n2) 
	{
		long answer = (n1 * n2) / (gcd(n1, n2));
		return answer;
	}
	
	static class FastScanner2 
	{
		private byte[] buf = new byte[1024];
		private int curChar;
		private int snumChars;

		public int read() 
		{
			if (snumChars == -1)
				throw new InputMismatchException();
			if (curChar >= snumChars) 
			{
				curChar = 0;
				try 
				{
					snumChars = System.in.read(buf);
				} catch (IOException e) 
				{
					throw new InputMismatchException();
				}
				if (snumChars <= 0)
					return -1;
			}
			return buf[curChar++];
		}

		public String nextLine() 
		{
			int c = read();
			while (isSpaceChar(c))
				c = read();
			StringBuilder res = new StringBuilder();
			do 
			{
				res.appendCodePoint(c);
				c = read();
			} 
			while (!isEndOfLine(c));
			return res.toString();
		}

		public String nextString() 
		{
			int c = read();
			while (isSpaceChar(c))
				c = read();
			StringBuilder res = new StringBuilder();
			do 
			{
				res.appendCodePoint(c);
				c = read();
			} 
			while (!isSpaceChar(c));
			return res.toString();
		}

		public long nextLong()
		{
			int c = read();
			while (isSpaceChar(c))
				c = read();
			int sgn = 1;
			if (c == '-') {
				sgn = -1;
				c = read();
			}
			long res = 0;
			do 
			{
				if (c < '0' || c > '9')
					throw new InputMismatchException();
				res *= 10;
				res += c - '0';
				c = read();
			} 
			while (!isSpaceChar(c));
			return res * sgn;
		}

		public int nextInt() 
		{
			int c = read();
			while (isSpaceChar(c))
				c = read();
			int sgn = 1;
			if (c == '-') {
				sgn = -1;
				c = read();
			}
			int res = 0;
			do 
			{
				if (c < '0' || c > '9')
					throw new InputMismatchException();
				res *= 10;
				res += c - '0';
				c = read();
			} 
			while (!isSpaceChar(c));
			return res * sgn;
		}

		public int[] nextIntArray(int n)
		{
			int[] arr = new int[n];
			for (int i = 0; i < n; i++) 
			{
				arr[i] = nextInt();
			}
			return arr;
		}

		public long[] nextLongArray(int n)
		{
			long[] arr = new long[n];
			for (int i = 0; i < n; i++) 
			{
				arr[i] = nextLong();
			}
			return arr;
		}

		private boolean isSpaceChar(int c)
		{
			return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
		}

		private boolean isEndOfLine(int c) 
		{
			return c == '\n' || c == '\r' || c == -1;
		}
	}

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

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

		public String nextLine() 
		{
			String fullLine = null;
			while (tokenizer == null || !tokenizer.hasMoreTokens())
			{
				try 
				{
					fullLine = reader.readLine();
				} catch (IOException e)
				{
					throw new RuntimeException(e);
				}
				return fullLine;
			}
			return fullLine;
		}

		public String next()
		{
			while (tokenizer == null || !tokenizer.hasMoreTokens()) 
			{
				try 
				{
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) 
				{
					throw new RuntimeException(e);
				}
			}
			return tokenizer.nextToken();
		}

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

		public int[] nextIntArray(int n) 
		{
			int a[] = new int[n];
			for (int i = 0; i < n; i++) 
			{
				a[i] = nextInt();
			}
			return a;
		}

		public long[] nextLongArray(int n)
		{
			long a[] = new long[n];
			for (int i = 0; i < n; i++) 
			{
				a[i] = nextLong();
			}
			return a;
		}

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

	static class OutputWriter 
	{
		private final PrintWriter writer;

		public OutputWriter(OutputStream outputStream) 
		{
			writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
		}

		public OutputWriter(Writer writer)
		{
			this.writer = new PrintWriter(writer);
		}

		public void print(Object... objects)
		{
			for (int i = 0; i < objects.length; i++) 
			{
				if (i != 0)
					writer.print(' ');
				writer.print(objects[i]);
			}
		}

		public void println(Object... objects)
		{
			print(objects);
			writer.println();
		}

		public void close() 
		{
			writer.close();
		}

		public void flush() 
		{
			writer.flush();
		}
	}
private static boolean oj = System.getProperty("ONLINE_JUDGE") != null;
	
	private static void tr(Object... o) 
	{
		if (!oj)
			System.out.println(Arrays.deepToString(o));
	}
}