#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    int x=2*n-1;
    char a[x][x];
    for(int i=0;i<x;i++){
        for(int j=0;j<x;j++){
            a[i][j]='.';
        }
    }
    int y=n-1;
    for(int d=0;d<n;d++){
        char ch='A'+(n-1-d);
        a[y-d][y]=ch;
        a[y+d][y]=ch;
        a[y][y-d]=ch;
        a[y][y+d]=ch;
        a[y-d][y-d]=ch;
        a[y-d][y+d]=ch;
        a[y+d][y-d]=ch;
        a[y+d][y+d]=ch;
    }for(int i=0;i<x;i++){
        for(int j=0;j<x;j++){
            cout<<a[i][j];
        }cout<<endl;
    }
    return 0;
}