import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        String N = sc.next();
		String ans = "ABC";

		if (N.equals("ABC")) {
			ans = "ARC";
		}

		System.out.println(ans);

        sc.close();
    }    
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        String N = sc.next();
		String ans = "ABC";

		if (N.equals("ABC")) {
			ans = "ARC";
		}

		System.out.println(ans);

        sc.close();
    }    
} Main public static void main(String[] args) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        String N = sc.next();
		String ans = "ABC";

		if (N.equals("ABC")) {
			ans = "ARC";
		}

		System.out.println(ans);

        sc.close();
    } main {
        
        Scanner sc = new Scanner(System.in);
        String N = sc.next();
		String ans = "ABC";

		if (N.equals("ABC")) {
			ans = "ARC";
		}

		System.out.println(ans);

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

		if (N.equals("ABC")) {
			ans = "ARC";
		}

		System.out.println(ans);

        sc.close();
    }    
} public class Main {
    public static void main(String[] args) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        String N = sc.next();
		String ans = "ABC";

		if (N.equals("ABC")) {
			ans = "ARC";
		}

		System.out.println(ans);

        sc.close();
    }    
} Main
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        String N = sc.next();
		String ans = "ABC";

		if (N.equals("ABC")) {
			ans = "ARC";
		}

		System.out.println(ans);

        sc.close();
    }    
}
