#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, c;
  cin >> a >> b >> c;

  if (a > b && b > c) cout << "A\nB\nC\n";
  if (a > c && c > b) cout << "A\nC\nB\n";
  if (b > a && a > c) cout << "B\nA\nC\n";
  if (b > c && c > a) cout << "B\nC\nA\n";
  if (c > a && a > b) cout << "C\nA\nB\n";
  if (c > b && b > a) cout << "C\nB\nA\n";
}