import java.util.Scanner;

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

	}
}