#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    int n,i,j;
   cin>>n;
   string inp[n];
   for(i=0;i<n;i++)
   {
     cin>>inp[i];
   }
   for(i=0;i<n;i++)
   {
     for(j=0;j<n;j++)
     {
       if(i == 0 || j == 0 || i == n-1 || j == n-1 )
       {
         cout<<inp[i][j];
       }
       else if(inp[i][j] > inp[i][j-1] && inp[i][j] > inp[i][j+1] && inp[i][j] >inp[i-1][j] && inp[i][j] > inp[i+1][j])
       {
         cout<<"X" ;
       }
       else
       {
         cout<<inp[i][j];
       }
     }
     cout<<endl;
   }
    return 0;
}