#include <stdio.h>
#include <algorithm>
#include <iostream>
#include <string>
#include <vector>
#include <functional>
#include <map>
#include <iomanip>
#include <math.h> 
#include <stack>
#include <queue>
#include <bitset>
#include <cstdlib>
#include <tuple>
#include <cctype>
#include <ctype.h>
#include <set>
#include <sstream>

using namespace std;



int main() {
	int i, j, k;
	vector<pair<int, pair<int, char> >>list;

	for (i = 0; i < 3; i++) {
		int num1, num2;
		cin >> num1 >> num2;

		list.push_back(make_pair(-num1, make_pair(num2, (char)'A'+i)));
	}

	sort(list.begin(), list.end());

	for (i = 0; i < 3; i++) {
		cout << list[i].second.second << endl;
	}




	getchar();
	getchar();
	return 0;
}