#include <bits/stdc++.h>
using namespace std;

int main() {
    vector<pair<int, string>> s(3);
    for (char a = 'A'; a <= 'C'; a++) {
        cin >> s[a-'A'].first;
        s[a-'A'].second = a;
    }
    
    sort(s.rbegin(), s.rend());
    
    for (const auto &e : s) cout << e.second << endl;
    return 0;
}