#include <bits/stdc++.h>   int main() {     int n, m;     scanf( %d %d , &n, &m);     char a[1005][1005];     for (int k = 0; k < n; k++) {       scanf( %s , a[k]);     }     char b[1005][1005] = {0};     for (int x = 1; x < n - 1; x++) {       for (int y = 1; y < m - 1; y++) {         if (a[x - 1][y] ==  #  && a[x - 1][y - 1] ==  #  &&             a[x - 1][y + 1] ==  # ) {           if (a[x][y + 1] ==  #  && a[x][y - 1] ==  #  &&               a[x + 1][y - 1] ==  #  && a[x + 1][y] ==  #  &&               a[x + 1][y + 1] ==  # )             b[x][y] =  2 ;         }       }     }     for (int x = 1; x < n - 1; x++) {       for (int y = 1; y < m - 1; y++) {         if (b[x][y] ==  2 ) {           a[x - 1][y] =  . ;           a[x - 1][y - 1] =  . ;           a[x - 1][y + 1] =  . ;           a[x][y - 1] =  . ;           a[x][y + 1] =  . ;           a[x + 1][y] =  . ;           a[x + 1][y - 1] =  . ;           a[x + 1][y + 1] =  . ;         }       }     }     int book = 1;     for (int k = 0; k < n; k++) {       for (int y = 0; y < m; y++) {         if (a[k][y] ==  # ) book = 0;         if (book == 0) break;       }     }     if (book == 1)       printf( YES );     else       printf( NO );   }   