#include <bits/stdc++.h>

using namespace std;
char a[] = {'A', 'B', 'C'};
int main() {
    // AB AC BC 要
    // BA CB CA x
    for (int i = 0; i < 3; i++)
        for (int j = 0; j < 3; j++)
            cout << a[i] << a[j] << " ";

    puts("");
    for (int i = 0; i < 3; i++)
        for (int j = i + 1; j < 3; j++)
            cout << a[i] << a[j] << " ";
    return 0;
}