import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    sc.close();

    String ans = "ARC".equals(S) ? "ABC" : "ARC";
    System.out.println(ans);
  }
} import java.util.*; util.* java public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    sc.close();

    String ans = "ARC".equals(S) ? "ABC" : "ARC";
    System.out.println(ans);
  }
} Main public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    sc.close();

    String ans = "ARC".equals(S) ? "ABC" : "ARC";
    System.out.println(ans);
  } main {
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    sc.close();

    String ans = "ARC".equals(S) ? "ABC" : "ARC";
    System.out.println(ans);
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String S = sc.next(); S sc.next() sc.next sc sc.close() sc.close sc String ans = "ARC".equals(S) ? "ABC" : "ARC"; ans "ARC".equals(S) ? "ABC" : "ARC" "ARC".equals(S) "ARC".equals "ARC" S "ABC" "ARC" System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    sc.close();

    String ans = "ARC".equals(S) ? "ABC" : "ARC";
    System.out.println(ans);
  }
} public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    sc.close();

    String ans = "ARC".equals(S) ? "ABC" : "ARC";
    System.out.println(ans);
  }
} Main
import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    sc.close();

    String ans = "ARC".equals(S) ? "ABC" : "ARC";
    System.out.println(ans);
  }
}
