#include <iostream>
#include <vector>
#include <algorithm> 
#include <queue>
#include <functional>
#include <map>
#include <string>
using namespace std;
typedef long long ll;

struct person{ int hight, weight; char name; };
bool comp(const person& a,const person& b){
    if (a.hight != b.hight){
        return a.hight > b.hight;
    }
    
    return a.weight < b.weight;
}
int main(void){
    string s = "ABC";
    vector<person> v(3);

    for (int i = 0; i < 3; i++){
        int h, w;
        cin >> h >> w;
        v.push_back({ h, w, s[i] });
    }

    sort(v.begin(), v.end(), comp);

    for (int i = 0; i < 3; i++){
        cout << v[i].name << endl;
    }


}