import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		try (Scanner scn = new Scanner(System.in)) {
			String S = scn.next();

			if(S.charAt(1) == 'B') {
				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) {
		try (Scanner scn = new Scanner(System.in)) {
			String S = scn.next();

			if(S.charAt(1) == 'B') {
				System.out.println("ARC");
			} else {
				System.out.println("ABC");
			}
		}
	}
} Main public static void main(String[] args) {
		try (Scanner scn = new Scanner(System.in)) {
			String S = scn.next();

			if(S.charAt(1) == 'B') {
				System.out.println("ARC");
			} else {
				System.out.println("ABC");
			}
		}
	} main {
		try (Scanner scn = new Scanner(System.in)) {
			String S = scn.next();

			if(S.charAt(1) == 'B') {
				System.out.println("ARC");
			} else {
				System.out.println("ABC");
			}
		}
	} try (Scanner scn = new Scanner(System.in)) {
			String S = scn.next();

			if(S.charAt(1) == 'B') {
				System.out.println("ARC");
			} else {
				System.out.println("ABC");
			}
		} {
			String S = scn.next();

			if(S.charAt(1) == 'B') {
				System.out.println("ARC");
			} else {
				System.out.println("ABC");
			}
		} Scanner scn = new Scanner(System.in) Scanner scn = new Scanner(System.in) new Scanner(System.in) String S = scn.next(); S scn.next() scn.next scn if(S.charAt(1) == 'B') {
				System.out.println("ARC");
			} else {
				System.out.println("ABC");
			} S.charAt(1) == 'B' S.charAt(1) S.charAt S 1 'B' {
				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) {
		try (Scanner scn = new Scanner(System.in)) {
			String S = scn.next();

			if(S.charAt(1) == 'B') {
				System.out.println("ARC");
			} else {
				System.out.println("ABC");
			}
		}
	}
} public class Main {
	public static void main(String[] args) {
		try (Scanner scn = new Scanner(System.in)) {
			String S = scn.next();

			if(S.charAt(1) == 'B') {
				System.out.println("ARC");
			} else {
				System.out.println("ABC");
			}
		}
	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		try (Scanner scn = new Scanner(System.in)) {
			String S = scn.next();

			if(S.charAt(1) == 'B') {
				System.out.println("ARC");
			} else {
				System.out.println("ABC");
			}
		}
	}
}