import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String X = sc.next();
		String ans1 = "ABC";
		String ans2 = "ARC";

		if(X.contentEquals(ans1)) {
			System.out.println(ans2);
		}else {
			System.out.println(ans1);
		}
	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String X = sc.next();
		String ans1 = "ABC";
		String ans2 = "ARC";

		if(X.contentEquals(ans1)) {
			System.out.println(ans2);
		}else {
			System.out.println(ans1);
		}
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String X = sc.next();
		String ans1 = "ABC";
		String ans2 = "ARC";

		if(X.contentEquals(ans1)) {
			System.out.println(ans2);
		}else {
			System.out.println(ans1);
		}
	} main {
		Scanner sc = new Scanner(System.in);
		String X = sc.next();
		String ans1 = "ABC";
		String ans2 = "ARC";

		if(X.contentEquals(ans1)) {
			System.out.println(ans2);
		}else {
			System.out.println(ans1);
		}
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String X = sc.next(); X sc.next() sc.next sc String ans1 = "ABC"; ans1 "ABC" String ans2 = "ARC"; ans2 "ARC" if(X.contentEquals(ans1)) {
			System.out.println(ans2);
		}else {
			System.out.println(ans1);
		} X.contentEquals(ans1) X.contentEquals X ans1 {
			System.out.println(ans2);
		} System.out.println(ans2) System.out.println System.out System System.out ans2 {
			System.out.println(ans1);
		} System.out.println(ans1) System.out.println System.out System System.out ans1 String[] args args public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String X = sc.next();
		String ans1 = "ABC";
		String ans2 = "ARC";

		if(X.contentEquals(ans1)) {
			System.out.println(ans2);
		}else {
			System.out.println(ans1);
		}
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String X = sc.next();
		String ans1 = "ABC";
		String ans2 = "ARC";

		if(X.contentEquals(ans1)) {
			System.out.println(ans2);
		}else {
			System.out.println(ans1);
		}
	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String X = sc.next();
		String ans1 = "ABC";
		String ans2 = "ARC";

		if(X.contentEquals(ans1)) {
			System.out.println(ans2);
		}else {
			System.out.println(ans1);
		}
	}
}
