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

public class Main {
	
	public static long MOD = 1000000007;
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		// pair があれば楽にできるのに
		final long A = sc.nextLong();
		final long B = sc.nextLong();
		final long C = sc.nextLong();
		
		final long max = Math.max(A, Math.max(B, C));
		final long min = Math.min(A, Math.min(B, C));
		
		if(max == A){
			if(min == B){
				System.out.printf("%s\n%s\n%s\n", "A", "C", "B");
			}else{
				System.out.printf("%s\n%s\n%s\n", "A", "B", "C");
			}
		}else if(max == B){
			if(min == A){
				System.out.printf("%s\n%s\n%s\n", "B", "C", "A");
			}else{
				System.out.printf("%s\n%s\n%s\n", "B", "A", "C");
			}
		}else{
			if(min == A){
				System.out.printf("%s\n%s\n%s\n", "C", "B", "A");
			}else{
				System.out.printf("%s\n%s\n%s\n", "C", "A", "B");
			}
		}
	
	}
}