package yukicoder;

import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;

public class No574 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        Integer[] h = new Integer[3], w = new Integer[3];
        int change;

        for(int i = 0; i < 3; i++) {
            h[i] = sc.nextInt() * 100 + 65 + i;
            w[i] = sc.nextInt();
        }

        Arrays.sort(h, Comparator.reverseOrder());
        for(int i = 0; i < 2; i++) {
            if(h[i] == h[i + 1] && w[i] > w[i + 1]) {
                change = h[i];
                h[i] = h[i + 1];
                h[i + 1] = change;
            }
        }

        for(int each : h) {
            System.out.println((char)(each % 100));
        }
    }
}