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

int main(){
    int ha,hb,hc;
    cin >> ha;
    cin >> hb;
    cin >> hc;
    vector<pair<int,string>> ans(3);
    ans.push_back(make_pair(ha,"A"));
    ans.push_back(make_pair(hb,"B"));
    ans.push_back(make_pair(hc,"C"));
    sort(ans.begin(),ans.end());
    reverse(ans.begin(),ans.end());
    
    cout << ans[0].second << endl;
    cout << ans[1].second << endl;
    cout << ans[2].second << endl;
    
}