import java.util.Scanner;


public class Main {

	public static void main(String[] args)  {

		Scanner sc = new Scanner(System.in);
		String A =  sc.next();
		String ans = "ABC";
		
		if(A.equals(ans)) {
			ans = "ARC";
		}
		
		System.out.println(ans);
	}



}
 import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args)  {

		Scanner sc = new Scanner(System.in);
		String A =  sc.next();
		String ans = "ABC";
		
		if(A.equals(ans)) {
			ans = "ARC";
		}
		
		System.out.println(ans);
	}



} Main public static void main(String[] args)  {

		Scanner sc = new Scanner(System.in);
		String A =  sc.next();
		String ans = "ABC";
		
		if(A.equals(ans)) {
			ans = "ARC";
		}
		
		System.out.println(ans);
	} main {

		Scanner sc = new Scanner(System.in);
		String A =  sc.next();
		String ans = "ABC";
		
		if(A.equals(ans)) {
			ans = "ARC";
		}
		
		System.out.println(ans);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String A =  sc.next(); A sc.next() sc.next sc String ans = "ABC"; ans "ABC" if(A.equals(ans)) {
			ans = "ARC";
		} A.equals(ans) A.equals A ans {
			ans = "ARC";
		} ans = "ARC" ans "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 A =  sc.next();
		String ans = "ABC";
		
		if(A.equals(ans)) {
			ans = "ARC";
		}
		
		System.out.println(ans);
	}



} public class Main {

	public static void main(String[] args)  {

		Scanner sc = new Scanner(System.in);
		String A =  sc.next();
		String ans = "ABC";
		
		if(A.equals(ans)) {
			ans = "ARC";
		}
		
		System.out.println(ans);
	}



} Main
import java.util.Scanner;


public class Main {

	public static void main(String[] args)  {

		Scanner sc = new Scanner(System.in);
		String A =  sc.next();
		String ans = "ABC";
		
		if(A.equals(ans)) {
			ans = "ARC";
		}
		
		System.out.println(ans);
	}



}

