import java.io.*;
import java.util.*;


public class Main_yukicoder570 {

	private static Scanner sc;
	private static Printer pr;

	private static void solve() {
		int ha = sc.nextInt();
		int hb = sc.nextInt();
		int hc = sc.nextInt();

		if (ha > hb && hb > hc) {
			pr.println('A');
			pr.println('B');
			pr.println('C');
		} else if (ha > hc && hc > hb) {
			pr.println('A');
			pr.println('C');
			pr.println('B');
		} else if (hb > ha && ha > hc) {
			pr.println('B');
			pr.println('A');
			pr.println('C');
		} else if (hb > hc && hc > ha) {
			pr.println('B');
			pr.println('C');
			pr.println('A');
		} else if (hc > ha && ha > hb) {
			pr.println('C');
			pr.println('A');
			pr.println('B');
		} else if (hc > hb && hb > ha) {
			pr.println('C');
			pr.println('B');
			pr.println('A');
		}
	}

	// ---------------------------------------------------
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		pr = new Printer(System.out);

		solve();

		pr.close();
		sc.close();
	}

	private static class Printer extends PrintWriter {
		Printer(PrintStream out) {
			super(out);
		}
	}
}