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