import java.util.Scanner;

public class Main {

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

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

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

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

public class Main {

	public static void main(String[] args) {
		Scanner scan=new Scanner(System.in);
		String S=scan.nextLine();
		String a="ABC";
		String b="ARC";
		if(S.equals(a))
		{
			System.out.println(b);
		}
		else
		{
			System.out.println(a);
		}
	}
}
