#include <bits/stdc++.h>
using namespace std;

int main()
{
    ios_base::sync_with_stdio(false); cin.tie(nullptr);
    int n , m; cin >> n >> m;
    char arr[n+2][m+2] = {};
    for (int i = 1; i <= n; i++)
    {
        for (int j = 1; j <= m; j++)
        {
            cin >> arr[i][j];
        }
        
    }
    int x,y; cin >> x >> y;
    if(arr[x-1][y] == '.' ||  arr[x-1][y-1] == '.' || arr[x][y-1] == '.' || arr[x+1][y] == '.' ||  arr[x+1][y-1] == '.' || arr[x+1][y+1] == '.' || arr[x][y+1] == '.' || arr[x+1][y] == '.' || arr[x-1][y+1] == '.')  
    {
        cout << "no";
    }
    else
    {
        cout << "yes";
    }
    
    
}