#include <iostream>
using namespace std;

int main() {
    char c;
    cin >>c;

    int len = c-'A'+1;

    for (int i =1; i <=len; i++) {
        //int tmp_len = len;
        for (int j=1; j<len-i+1; j++) {
            cout <<" ";
        }
        for (int j=1; j<=2*i-1; j++) {

            if (j > i) {//i=3 4>3
                //j%tmp_len// 1 B  2 A
                cout <<char('A'+i-(j%i)-1);//D->B >>-2 
            } else 
                cout <<char('A'+j-1);
        }
        cout <<endl;
    }

    return 0;
}