#include<iostream>
#include<string>
#include<string.h>
#include<algorithm>
#include<stdio.h>
#include<cmath>
#include<vector>
#include<utility>
#include<stack>
#include<queue>
#include<list>
#include<bitset>
#include<functional>

#define FOR(i, a, b) for(int i=(a);i<=(b);i++)
#define RFOR(i, a, b) for(int i=(a);i>=(b);i--)
#define MOD 1000000007
#define INF 1000000000
#define PI 3.14159265358979

using namespace std;
typedef pair<int, int> P;

int main(void) {
	int ha, hb, hc, wa, wb, wc;
	int flag;

	cin >> ha >> wa >> hb >> wb >> hc >> wc;

	if (ha > hb) {
		if (ha > hc) {
			if (hb > hc) {
				flag = 1;
			}
			else if (hb < hc) {
				flag = 2;
			}
			else if (hb == hc) {
				if (wb < wc) {
					flag = 1;
				}
				else if (wb > wc) {
					flag = 2;
				}
			}
		}
		else if (ha < hc) {
			flag = 5;
		}
		else if (ha == hc) {
			if (wa > wc) {
				flag = 5;
			}
			else if (wa < wc) {
				flag = 2;
			}
		}
	}
	else if (ha < hb) {
		if (ha < hc) {
			if (hb > hc) {
				flag = 4;
			}
			else if (hb < hc) {
				flag = 6;
			}
			else if (hb == hc) {
				if (wb > wc) {
					flag = 6;
				}
				else if (wb < wc) {
					flag = 4;
				}
			}
		}
		else if (ha > hc) {
			flag = 3;
		}
		else if (ha == hc) {
			if (wa > wc) {
				flag = 4;
			}
			else if (wa < wc) {
				flag = 3;
			}
		}
	}
	else if (ha == hb) {
		if (ha > hc) {
			if (wa > wb) {
				flag = 3;
			}
			else if (wa < wb) {
				flag = 1;
			}
		}
		else if (ha < hc) {
			if (wa > wb) {
				flag = 6;
			}
			else if (wa < wb) {
				flag = 5;
			}
		}
		else if (ha == hc) {
			if (wa < wb) {
				if (wa < wc) {
					if (wb > wc) {
						flag = 2;
					}
					else if (wb < wc) {
						flag = 1;
					}
				}
				else if (wa > wc) {
					flag = 5;
				}
			}
			else if (wa > wb) {
				if (wa < wc) {
					flag = 3;
				}
				else if (wa > wc) {
					if (wb > wc) {
						flag = 6;
					}
					else if (wb < wc) {
						flag = 4;
					}
				}
			}
		}
	}

	switch (flag) {
	case 1:
		cout << 'A' << endl;
		cout << 'B' << endl;
		cout << 'C' << endl;
		break;
	case 2:
		cout << 'A' << endl;
		cout << 'C' << endl;
		cout << 'B' << endl;
		break;
	case 3:
		cout << 'B' << endl;
		cout << 'A' << endl;
		cout << 'C' << endl;
		break;
	case 4:
		cout << 'B' << endl;
		cout << 'C' << endl;
		cout << 'A' << endl;
		break;
	case 5:
		cout << 'C' << endl;
		cout << 'A' << endl;
		cout << 'B' << endl;
		break;
	case 6:
		cout << 'C' << endl;
		cout << 'B' << endl;
		cout << 'A' << endl;
		break;
	}


	
	return 0;
}