import java.util.Scanner;

public class Main{ 
	public static void main(String args[]){
    	String x = new String("ABC");
      	String y = new String("ARC");
      	Scanner scan = new Scanner(System.in);
      	String s = scan.next();
      	// System.out.println(s);
      	// System.out.println(x);
      	// System.out.println(y);
      	if(s.equals(x)) System.out.println(y);
      	else System.out.println(x);
      	scan.close();
    }
} import java.util.Scanner; Scanner java.util public class Main{ 
	public static void main(String args[]){
    	String x = new String("ABC");
      	String y = new String("ARC");
      	Scanner scan = new Scanner(System.in);
      	String s = scan.next();
      	// System.out.println(s);
      	// System.out.println(x);
      	// System.out.println(y);
      	if(s.equals(x)) System.out.println(y);
      	else System.out.println(x);
      	scan.close();
    }
} Main public static void main(String args[]){
    	String x = new String("ABC");
      	String y = new String("ARC");
      	Scanner scan = new Scanner(System.in);
      	String s = scan.next();
      	// System.out.println(s);
      	// System.out.println(x);
      	// System.out.println(y);
      	if(s.equals(x)) System.out.println(y);
      	else System.out.println(x);
      	scan.close();
    } main {
    	String x = new String("ABC");
      	String y = new String("ARC");
      	Scanner scan = new Scanner(System.in);
      	String s = scan.next();
      	// System.out.println(s);
      	// System.out.println(x);
      	// System.out.println(y);
      	if(s.equals(x)) System.out.println(y);
      	else System.out.println(x);
      	scan.close();
    } String x = new String("ABC"); x new String("ABC") String y = new String("ARC"); y new String("ARC") Scanner scan = new Scanner(System.in); scan new Scanner(System.in) String s = scan.next(); s scan.next() scan.next scan if(s.equals(x)) System.out.println(y);
      	else System.out.println(x); s.equals(x) s.equals s x System.out.println(y) System.out.println System.out System System.out y System.out.println(x) System.out.println System.out System System.out x scan.close() scan.close scan String args[] args public class Main{ 
	public static void main(String args[]){
    	String x = new String("ABC");
      	String y = new String("ARC");
      	Scanner scan = new Scanner(System.in);
      	String s = scan.next();
      	// System.out.println(s);
      	// System.out.println(x);
      	// System.out.println(y);
      	if(s.equals(x)) System.out.println(y);
      	else System.out.println(x);
      	scan.close();
    }
} public class Main{ 
	public static void main(String args[]){
    	String x = new String("ABC");
      	String y = new String("ARC");
      	Scanner scan = new Scanner(System.in);
      	String s = scan.next();
      	// System.out.println(s);
      	// System.out.println(x);
      	// System.out.println(y);
      	if(s.equals(x)) System.out.println(y);
      	else System.out.println(x);
      	scan.close();
    }
} Main
import java.util.Scanner;

public class Main{ 
	public static void main(String args[]){
    	String x = new String("ABC");
      	String y = new String("ARC");
      	Scanner scan = new Scanner(System.in);
      	String s = scan.next();
      	// System.out.println(s);
      	// System.out.println(x);
      	// System.out.println(y);
      	if(s.equals(x)) System.out.println(y);
      	else System.out.println(x);
      	scan.close();
    }
}