#include <bits/stdc++.h>

using namespace std;

int main() {
    string s;
    vector<string> v;
    
    for (int i = 0; i < 3; i++) {
        cin >> s;
        s += ('A' + i);
        v.push_back(s);
    }
    
    sort(v.begin(), v.end(), greater<string>());
    
    for (int i = 0; i < 3; i++) {
        cout << v[i][v[i].length() - 1] << endl;
    }
    
    return 0;
}