#include <iostream>
#include <stdio.h>
#include <algorithm>
#include <vector>
#include <cmath>
#include <string>
#include <sstream>
#include<sstream>
#include <queue>
#include <limits>
#include <cstdlib>
#include <deque>
#include <map>
#include <set>
#include <iomanip>
using namespace std;

int main() {

	vector<pair<int, int> > height_weight;

	pair<int, int> a;
	pair<int, int> b;
	pair<int, int> c;

	int first = 0;
	int second = 0;
	int mozi[301];
	cin >> first >> second;
	a = make_pair(first, second);
	mozi[a.first+a.second] = 0;

	cin >> first >> second;
	b = make_pair(first, second);
	mozi[b.first+b.second] = 1;

	cin >> first >> second;
	c = make_pair(first, second);
	mozi[c.first+c.second] = 2;

	height_weight.push_back(a);
	height_weight.push_back(b);
	height_weight.push_back(c);

	sort(height_weight.begin(), height_weight.end(),
			greater<pair<int, int> >());

	if (height_weight[0].first == height_weight[1].first) {
		if (height_weight[0].second > height_weight[1].second) {
			if (mozi[height_weight[1].first+height_weight[1].second] == 0) {
				cout << "A" << endl;
			} else if (mozi[height_weight[1].first+height_weight[1].second] == 1) {
				cout << "B" << endl;
			} else {
				cout << "C" << endl;
			}
		} else {
			if (mozi[height_weight[0].first+height_weight[0].second] == 0) {
				cout << "A" << endl;
			} else if (mozi[height_weight[0].first+height_weight[0].second] == 1) {
				cout << "B" << endl;
			} else {
				cout << "C" << endl;
			}
		}
	} else {
		if (mozi[height_weight[0].first+height_weight[0].second] == 0) {
			cout << "A" << endl;
		} else if (mozi[height_weight[0].first+height_weight[0].second] == 1) {
			cout << "B" << endl;
		} else {
			cout << "C" << endl;
		}
	}

	if (height_weight[1].first == height_weight[2].first) {
		if (height_weight[1].second > height_weight[2].second) {
			if (mozi[height_weight[2].first+height_weight[2].second] == 0) {
				cout << "A" << endl;
			} else if (mozi[height_weight[2].first+height_weight[2].second] == 1) {
				cout << "B" << endl;
			} else {
				cout << "C" << endl;
			}

			if (mozi[height_weight[1].first+height_weight[1].second] == 0) {
				cout << "A" << endl;
			} else if (mozi[height_weight[1].first+height_weight[1].second] == 1) {
				cout << "B" << endl;
			} else {
				cout << "C" << endl;
			}
		} else {
			if (mozi[height_weight[1].first+height_weight[1].second] == 0) {
				cout << "A" << endl;
			} else if (mozi[height_weight[1].first+height_weight[1].second] == 1) {
				cout << "B" << endl;
			} else {
				cout << "C" << endl;
			}

			if (mozi[height_weight[2].first+height_weight[2].second] == 0) {
				cout << "A" << endl;
			} else if (mozi[height_weight[2].first+height_weight[2].second] == 1) {
				cout << "B" << endl;
			} else {
				cout << "C" << endl;
			}
		}
	} else {
		if (mozi[height_weight[1].first+height_weight[1].second] == 0) {
			cout << "A" << endl;
		} else if (mozi[height_weight[1].first+height_weight[1].second] == 1) {
			cout << "B" << endl;
		} else {
			cout << "C" << endl;
		}

		if (mozi[height_weight[2].first+height_weight[2].second] == 0) {
			cout << "A" << endl;
		} else if (mozi[height_weight[2].first+height_weight[2].second] == 1) {
			cout << "B" << endl;
		} else {
			cout << "C" << endl;
		}
	}

	return 0;
}