package yukicoder174;

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int max = Math.max(Math.max(a, b), c);
		int min = Math.min(Math.min(a, b), c);
		if(max == a) {
			System.out.println("A");
			if(min == b) {
				System.out.println("C");
				System.out.println("B");
			} else {
				System.out.println("B");
				System.out.println("C");
			}
		} else if(max == b) {
			System.out.println("B");
			if(min == a) {
				System.out.println("C");
				System.out.println("A");
			} else {
				System.out.println("A");
				System.out.println("C");
			}
		} else {
			System.out.println("C");
			if(min == b) {
				System.out.println("A");
				System.out.println("B");
			} else {
				System.out.println("B");
				System.out.println("A");
			}
		}
	}
}