package yukicoder174;

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int h1 = sc.nextInt(),w1 = sc.nextInt();
		int h2 = sc.nextInt(),w2 = sc.nextInt();
		int h3 = sc.nextInt(),w3 = sc.nextInt();
		if(h1 > h2) {
			if(h2 > h3) {
				System.out.println("A");
				System.out.println("B");
				System.out.println("C");
			} else if(h2 == h3) {
				if(w2 > w3) {
					System.out.println("A");
					System.out.println("C");
					System.out.println("B");
				} else {
					System.out.println("A");
					System.out.println("B");
					System.out.println("C");
				}
			}
		} else if(h1 > h3) {
			if(h3 > h2) {
				System.out.println("A");
				System.out.println("C");
				System.out.println("B");
			} else if(h3 == h2) {
				if(w3 > w2) {
					System.out.println("A");
					System.out.println("B");
					System.out.println("C");
				} else {
					System.out.println("A");
					System.out.println("C");
					System.out.println("B");
				}
			}

		} else if(h2 > h1) {
			if(h1 > h3) {
				System.out.println("B");
				System.out.println("A");
				System.out.println("C");
			} else if(h1 == h3) {
				if(w1 > w3) {
					System.out.println("B");
					System.out.println("C");
					System.out.println("A");
				} else {
					System.out.println("B");
					System.out.println("A");
					System.out.println("C");
				}
			}
		} else if(h2 > h3) {
			if(h3 > h1) {
				System.out.println("B");
				System.out.println("C");
				System.out.println("A");
			} else if(h3 == h1) {
				if(w3 > w1) {
					System.out.println("B");
					System.out.println("A");
					System.out.println("C");
				} else {
					System.out.println("A");
					System.out.println("C");
					System.out.println("B");
				}
			}
		} else if(h3 > h1) {
			if(h1 > h2) {
				System.out.println("C");
				System.out.println("A");
				System.out.println("B");
			} else if(h1 == h2) {
				if(w1 > w2) {
					System.out.println("C");
					System.out.println("B");
					System.out.println("A");
				} else {
					System.out.println("C");
					System.out.println("A");
					System.out.println("B");
				}
			}
		} else if(h3 > h2) {
			if(h2 > h1) {
				System.out.println("C");
				System.out.println("B");
				System.out.println("A");
			} else if(h2 == h1) {
				if(w2 > w1) {
					System.out.println("C");
					System.out.println("A");
					System.out.println("B");
				} else {
					System.out.println("C");
					System.out.println("B");
					System.out.println("A");
				}
			}
		}
	}
}