import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		sc.close();
		if(S.contains("ABC")) {
			System.out.println("ARC");
		}else {
			System.out.println("ABC");
		}

	}

} 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.next();
		sc.close();
		if(S.contains("ABC")) {
			System.out.println("ARC");
		}else {
			System.out.println("ABC");
		}

	}

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

	} main {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		sc.close();
		if(S.contains("ABC")) {
			System.out.println("ARC");
		}else {
			System.out.println("ABC");
		}

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

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		sc.close();
		if(S.contains("ABC")) {
			System.out.println("ARC");
		}else {
			System.out.println("ABC");
		}

	}

} public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		sc.close();
		if(S.contains("ABC")) {
			System.out.println("ARC");
		}else {
			System.out.println("ABC");
		}

	}

} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		sc.close();
		if(S.contains("ABC")) {
			System.out.println("ARC");
		}else {
			System.out.println("ABC");
		}

	}

}