import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String contestName = sc.nextLine();
		if (contestName.charAt(1) == 'B') {
			System.out.println("ARC");
		} else {
			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 contestName = sc.nextLine();
		if (contestName.charAt(1) == 'B') {
			System.out.println("ARC");
		} else {
			System.out.println("ABC");
		}
		sc.close();
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String contestName = sc.nextLine();
		if (contestName.charAt(1) == 'B') {
			System.out.println("ARC");
		} else {
			System.out.println("ABC");
		}
		sc.close();
	} main {
		Scanner sc = new Scanner(System.in);
		String contestName = sc.nextLine();
		if (contestName.charAt(1) == 'B') {
			System.out.println("ARC");
		} else {
			System.out.println("ABC");
		}
		sc.close();
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String contestName = sc.nextLine(); contestName sc.nextLine() sc.nextLine sc if (contestName.charAt(1) == 'B') {
			System.out.println("ARC");
		} else {
			System.out.println("ABC");
		} contestName.charAt(1) == 'B' contestName.charAt(1) contestName.charAt contestName 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" sc.close() sc.close sc String[] args args public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String contestName = sc.nextLine();
		if (contestName.charAt(1) == 'B') {
			System.out.println("ARC");
		} else {
			System.out.println("ABC");
		}
		sc.close();
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String contestName = sc.nextLine();
		if (contestName.charAt(1) == 'B') {
			System.out.println("ARC");
		} else {
			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 contestName = sc.nextLine();
		if (contestName.charAt(1) == 'B') {
			System.out.println("ARC");
		} else {
			System.out.println("ABC");
		}
		sc.close();
	}
}
