#include <string>
#include <iostream>
#include <cmath>
using namespace std;

main()
{
  int i, j, k, c;
  string s;

  for (i = 0; i < (int) pow(3.0, 10.0); i++) {
    s.clear();
    k = i;
    for (j = 0; j < 10; j++) {
      s.push_back('A' + k%3);
      k /= 3;
    }
    c = 0;
    for (j = 0; j < 10; j++) if (s[j] == 'C') c++;
    if (c == 1) cout << s << endl;
  }
}