#include <iostream>
#include <map>
#include <vector>
#include <algorithm>
using namespace std;

int main(void) {
    map<int, string> mp;
    int A,B,C;
    cin>>A>>B>>C;
    mp[A] = "A";
    mp[B] = "B";
    mp[C] = "C";
    vector<int> vc;
    vc.push_back(A);
    vc.push_back(B);
    vc.push_back(C);
    sort(vc.begin(), vc.end());
    reverse(vc.begin(), vc.end());
    cout << mp[vc.at(0)] << endl;
    cout << mp[vc.at(1)] << endl;
    cout << mp[vc.at(2)] << endl;
    return 0;
}