import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String str = sc.next();
		char[] a = str.toCharArray();
		if (a[1] == 'R') {
			System.out.println("ABC");
		} else {
			System.out.println("ARC");
		}

	}

} import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String str = sc.next();
		char[] a = str.toCharArray();
		if (a[1] == 'R') {
			System.out.println("ABC");
		} else {
			System.out.println("ARC");
		}

	}

} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String str = sc.next();
		char[] a = str.toCharArray();
		if (a[1] == 'R') {
			System.out.println("ABC");
		} else {
			System.out.println("ARC");
		}

	} main {
		Scanner sc = new Scanner(System.in);
		String str = sc.next();
		char[] a = str.toCharArray();
		if (a[1] == 'R') {
			System.out.println("ABC");
		} else {
			System.out.println("ARC");
		}

	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String str = sc.next(); str sc.next() sc.next sc char[] a = str.toCharArray(); a str.toCharArray() str.toCharArray str if (a[1] == 'R') {
			System.out.println("ABC");
		} else {
			System.out.println("ARC");
		} a[1] == 'R' a[1] a 1 'R' {
			System.out.println("ABC");
		} System.out.println("ABC") System.out.println System.out System System.out "ABC" {
			System.out.println("ARC");
		} System.out.println("ARC") System.out.println System.out System System.out "ARC" String[] args args public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String str = sc.next();
		char[] a = str.toCharArray();
		if (a[1] == 'R') {
			System.out.println("ABC");
		} else {
			System.out.println("ARC");
		}

	}

} public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String str = sc.next();
		char[] a = str.toCharArray();
		if (a[1] == 'R') {
			System.out.println("ABC");
		} else {
			System.out.println("ARC");
		}

	}

} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String str = sc.next();
		char[] a = str.toCharArray();
		if (a[1] == 'R') {
			System.out.println("ABC");
		} else {
			System.out.println("ARC");
		}

	}

}
