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#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;
}