#include <bits/stdc++.h>

using namespace std;

const int N = 2e5+5, INF = 1e9;

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int n, cnt = 0, i = -1;
    cin >> n;
    vector<vector<char>> m(n,vector<char>(n)), tm;
    set<vector<vector<char>>> s;
    for(int i = 0; i < n; ++i)
        for(int j = 0; j < n; ++j)
            cin >> m[i][j], cnt+=m[i][j]=='*';
    if(cnt==0){ cout << "No\n" << i+1; return 0;}
    tm = m;
    for(i = 0;!s.count(m); ++i){
        s.insert(m);
        cnt = 0;
        for(int i = 0; i < n; ++i){
            for(int j = 0; j < n; ++j){
                int k = 0;
                for(int x = -1; x < 2; ++x)
                    for(int y = -1; y < 2; ++y)
                        k+=((x|y)&&i+x>=0&&i+x<n&&j+y>=0&&j+y<n&&m[i+x][j+y]=='*');
                if(k==3) tm[i][j] = '*';
                if(k<2||k>3) tm[i][j] = 'x';
                cnt+=tm[i][j] =='*';
            }
        }
        if(cnt==0){ cout << "No\n" << i+1; return 0;}
        m = tm;
    }
    cout << "Yes\n" << i;

    return 0;
}