#include<bits/stdc++.h>
using namespace std;
int dir[4][2] = {{-1, 0},{1, 0},{0, -1},{0, 1}};
char mp[110][110];
int vis[110][110],m,n,flag=0;
struct node{
int x,y;
char val;
};
int main(){
cin>>n>>m;
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
cin>>mp[i][j];
}
}
if(mp[1][1] == '#'){
cout<<"NO";
return 0;
}
}