import java.util.Map.Entry;
import java.util.*;
 
import org.w3c.dom.css.Counter;
 
public class Main {
//public class App {
 
    public static void main(final String[] args){
     //スキャン
     final Scanner s = new Scanner(System.in);
     final String hoge = s.next();
     if(hoge.equals("ABC")){
         System.out.println("ARC");
     }else{
        System.out.println("ABC");
     }
    }
     
} import java.util.Map.Entry; Entry java.util.Map import java.util.*; util.* java import org.w3c.dom.css.Counter; Counter org.w3c.dom.css public class Main {
//public class App {
 
    public static void main(final String[] args){
     //スキャン
     final Scanner s = new Scanner(System.in);
     final String hoge = s.next();
     if(hoge.equals("ABC")){
         System.out.println("ARC");
     }else{
        System.out.println("ABC");
     }
    }
     
} Main public static void main(final String[] args){
     //スキャン
     final Scanner s = new Scanner(System.in);
     final String hoge = s.next();
     if(hoge.equals("ABC")){
         System.out.println("ARC");
     }else{
        System.out.println("ABC");
     }
    } main {
     //スキャン
     final Scanner s = new Scanner(System.in);
     final String hoge = s.next();
     if(hoge.equals("ABC")){
         System.out.println("ARC");
     }else{
        System.out.println("ABC");
     }
    } final Scanner s = new Scanner(System.in); s new Scanner(System.in) final String hoge = s.next(); hoge s.next() s.next s if(hoge.equals("ABC")){
         System.out.println("ARC");
     }else{
        System.out.println("ABC");
     } hoge.equals("ABC") hoge.equals hoge "ABC" {
         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" final String[] args args public class Main {
//public class App {
 
    public static void main(final String[] args){
     //スキャン
     final Scanner s = new Scanner(System.in);
     final String hoge = s.next();
     if(hoge.equals("ABC")){
         System.out.println("ARC");
     }else{
        System.out.println("ABC");
     }
    }
     
} public class Main {
//public class App {
 
    public static void main(final String[] args){
     //スキャン
     final Scanner s = new Scanner(System.in);
     final String hoge = s.next();
     if(hoge.equals("ABC")){
         System.out.println("ARC");
     }else{
        System.out.println("ABC");
     }
    }
     
} Main
import java.util.Map.Entry;
import java.util.*;
 
import org.w3c.dom.css.Counter;
 
public class Main {
//public class App {
 
    public static void main(final String[] args){
     //スキャン
     final Scanner s = new Scanner(System.in);
     final String hoge = s.next();
     if(hoge.equals("ABC")){
         System.out.println("ARC");
     }else{
        System.out.println("ABC");
     }
    }
     
}
