#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void cavityMap(int n,char** grid){
    for(int i=1;i<n-1;i++){
        for(int j=1;j<n-1;j++){
            if(grid[i][j]>grid[i][j-1]&&grid[i][j]>grid[i][j+1]&&grid[i][j]>grid[i-1][j]&&grid[i][j]>grid[i+1][j]){
                grid[i][j]='X';
            }
        }
    }
    for(int i=0;i<n;i++){
        printf("%s\n", grid[i]);
    }
}

int main()
{
    int n;
    scanf("%d",&n);
    char** grid=(char**)malloc(n*sizeof(char*));
    for(int i=0;i<n;i++)
    {
        grid[i]=(char*)malloc((n+1)*sizeof(char));
        scanf("%s",grid[i]);
    }
    cavityMap(n,grid);
    for(int i=0;i<n;i++)
        free(grid[i]);
    free(grid);
    return 0;
}