import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    if (S.charAt(1) == 'R') {
      System.out.println("ABC");
    } else {
      System.out.println("ARC");
    }
  }
} import java.util.*; util.* java public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    if (S.charAt(1) == 'R') {
      System.out.println("ABC");
    } else {
      System.out.println("ARC");
    }
  }
} Main public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    if (S.charAt(1) == 'R') {
      System.out.println("ABC");
    } else {
      System.out.println("ARC");
    }
  } main {
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    if (S.charAt(1) == 'R') {
      System.out.println("ABC");
    } else {
      System.out.println("ARC");
    }
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String S = sc.next(); S sc.next() sc.next sc if (S.charAt(1) == 'R') {
      System.out.println("ABC");
    } else {
      System.out.println("ARC");
    } S.charAt(1) == 'R' S.charAt(1) S.charAt S 1 'R' {
      System.out.println("ABC");
    } System.out.println("ABC") System.out.println System.out System System.out "ABC" {
      System.out.println("ARC");
    } System.out.println("ARC") System.out.println System.out System System.out "ARC" String[] args args public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    if (S.charAt(1) == 'R') {
      System.out.println("ABC");
    } else {
      System.out.println("ARC");
    }
  }
} public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    if (S.charAt(1) == 'R') {
      System.out.println("ABC");
    } else {
      System.out.println("ARC");
    }
  }
} Main
import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    if (S.charAt(1) == 'R') {
      System.out.println("ABC");
    } else {
      System.out.println("ARC");
    }
  }
}