#include <bits/stdc++.h> using namespace std; int main() { int N; cin>>N; int n = 2 * N - 1; char a[n][n] = {""}; int temp = 65; int mid = (n - 1) / 2; for(int i = 0;i < n;i++) { a[i][i] = char(temp); if(i < mid) { temp++; } else { temp--; } } temp = 65; int sum = 0; for(int i = n - 1;i >= 0;i--,sum++) { a[sum][i] = char(temp); if(i > mid && sum < mid) { temp++; } else { temp--; } } temp = 65; for(int i = 0;i < n;i++) { a[mid][i] = char(temp); if(i < mid) { temp++; } else { temp--; } } temp = 65; for(int i = 0;i < n;i++) { a[i][mid] = char(temp); if(i < mid) { temp++; } else { temp--; } } for(int i = 0;i < n;i++) { for(int j = 0;j < n;j++) { if(!(a[i][j] >= 'A' && a[i][j] <= 'Z')) { cout<<"."; } else { cout<<a[i][j]; } } cout<<endl; } return 0; }