import java.util.Scanner;

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

public class Main {
	public static void main(String[] args) {
		String b = "ABC";
		String r = "ARC";
		Scanner sc = new Scanner(System.in);
		String in = sc.nextLine();
		sc.close();
		if (b.equals(in)) {
			System.out.println(r);
		} else {
			System.out.println(b);
		}
	}
}
