#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define srep(i,s,t) for (int i = s; i < t; ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
using namespace std;
typedef long long int ll;
typedef pair<int,int> P;
#define yn {puts("Yes");}else{puts("No");}
#define MAX_N 200005

int main() {
    vector<pair<P,char>> v;
    rep(i,3){
        int h, w;
        cin >> h >> w;
        v.push_back(pair<P,char>(P(-h,w),'A'+i));
    }
    sort(v.begin(), v.end());
    rep(i,3)cout << v[i].second << endl;
    return 0;
}