import java.util.Scanner;

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

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