#include <string.h>
#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

bool pairCompare(const pair<string, int>& fir, const pair<string, int>& sec){
    return fir.second > sec.second;
}

int main(){
    vector<pair<string, int>> bro;
    int a,b,c;
    cin >> a >> b >> c;
    bro.push_back(make_pair("A", a));
    bro.push_back(make_pair("B", b));
    bro.push_back(make_pair("C", c));
    sort(bro.begin(), bro.end(), pairCompare);
    cout << bro[0].first << endl << bro[1].first << endl << bro[2].first;
}