import java.util.*;

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

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