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

template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

#define FOR(i,a,b) for(ll i=(a);i<(b);++i)
#define ALL(v) (v).begin(), (v).end()
#define p(s) cout<<(s)<<endl
#define p2(s, t) cout << (s) << " " << (t) << endl
#define br() p("")
#define pn(s) cout << (#s) << " " << (s) << endl

struct Human{
    ll height;
    ll weight;
    char name;
    Human(ll h, ll w, char c){
        height = h;
        weight = w;
        name = c;
    }
    bool operator<(const Human &another) const{
        if(height==another.height){
            return weight < another.weight;
        }else{
            return -height < -another.height;
        }
    }
};

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    // input
    vector<Human> A;
    
    FOR(i, 0, 3){
        ll h; cin >> h;
        ll w; cin >> w;
        char c = 'A' + i;
        A.push_back(Human(h, w, c));
    }
    sort(ALL(A));

    for(auto a : A){
        p(a.name);
    }
    
    return 0;
}