import java.util.*;

public class Main{
  static StringBuilder sb = new StringBuilder("");
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int A = sc.nextInt();
    int B = sc.nextInt();
    int C = sc.nextInt();
    sc.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");
      }
    }
  }
}