import java.util.Scanner;


public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		String s = sc.nextLine();

		if(s.equals("ABC") ) {
			System.out.println("ARC");
		}else if(s.equals("ARC") ) {
			System.out.println("ABC");
		}
		sc.close();
	}

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

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		String s = sc.nextLine();

		if(s.equals("ABC") ) {
			System.out.println("ARC");
		}else if(s.equals("ARC") ) {
			System.out.println("ABC");
		}
		sc.close();
	}

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

		Scanner sc = new Scanner(System.in);
		String s = sc.nextLine();

		if(s.equals("ABC") ) {
			System.out.println("ARC");
		}else if(s.equals("ARC") ) {
			System.out.println("ABC");
		}
		sc.close();
	} main {

		Scanner sc = new Scanner(System.in);
		String s = sc.nextLine();

		if(s.equals("ABC") ) {
			System.out.println("ARC");
		}else if(s.equals("ARC") ) {
			System.out.println("ABC");
		}
		sc.close();
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.nextLine(); s sc.nextLine() sc.nextLine sc if(s.equals("ABC") ) {
			System.out.println("ARC");
		}else if(s.equals("ARC") ) {
			System.out.println("ABC");
		} s.equals("ABC") s.equals s "ABC" {
			System.out.println("ARC");
		} System.out.println("ARC") System.out.println System.out System System.out "ARC" if(s.equals("ARC") ) {
			System.out.println("ABC");
		} s.equals("ARC") s.equals s "ARC" {
			System.out.println("ABC");
		} System.out.println("ABC") System.out.println System.out System System.out "ABC" sc.close() sc.close sc String[] args args public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		String s = sc.nextLine();

		if(s.equals("ABC") ) {
			System.out.println("ARC");
		}else if(s.equals("ARC") ) {
			System.out.println("ABC");
		}
		sc.close();
	}

} public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		String s = sc.nextLine();

		if(s.equals("ABC") ) {
			System.out.println("ARC");
		}else if(s.equals("ARC") ) {
			System.out.println("ABC");
		}
		sc.close();
	}

} Main
import java.util.Scanner;


public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		String s = sc.nextLine();

		if(s.equals("ABC") ) {
			System.out.println("ARC");
		}else if(s.equals("ARC") ) {
			System.out.println("ABC");
		}
		sc.close();
	}

}