import java.util.*;

public class Test {
	private static Scanner sc;
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		int A = sc.nextInt();
		int B = sc.nextInt();
		int C = sc.nextInt();
		if (A>B && A>C) {
			System.out.println("A");
			if (B>C) {
				System.out.println("B");
				System.out.println("C");
			} else {
				System.out.println("C");
				System.out.println("B");
			}
		} else if (B>A && B>C) {
			System.out.println("B");
			if (A>C) {
				System.out.println("A");
				System.out.println("C");
			} else {
				System.out.println("C");
				System.out.println("A");
			}
		} else {
			System.out.println("C");
			if (A>B) {
				System.out.println("A");
				System.out.println("B");
			} else {
				System.out.println("B");
				System.out.println("A");
			}
		}
	}
}