#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <map>
#include <stack>
#include <cmath>
#include <queue>
#include <numeric>

typedef struct human {
	int height;
	int weight;
	char name;
}HUMAN;

bool f(HUMAN a, HUMAN b) {
	if (a.height > b.height) return true;
	else if (a.height == b.height) {
		if (a.weight < b.weight) return true;
	}
	return false;
}

int main()
{
	HUMAN human[3];

	std::string name = "ABC";

	for (size_t i = 0; i < 3; i++)
	{
		std::cin >> human[i].height >> human[i].weight;
		human[i].name = name[i];
	}

	std::sort(human, human + 3, f);

	for (size_t i = 0; i < 3; i++)
	{
		std::cout << human[i].name << std::endl;
	}

	return 0;
}