import java.util.Scanner;
import java.util.Arrays;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String N=sc.next();
    if(N.equals("ABC")){
      System.out.println("ARC");
    }else{
      System.out.println("ABC");        
    }




  }
} import java.util.Scanner; Scanner java.util import java.util.Arrays; Arrays java.util import java.util.ArrayList; ArrayList java.util import java.util.List; List java.util import java.util.stream.Collectors; Collectors java.util.stream class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String N=sc.next();
    if(N.equals("ABC")){
      System.out.println("ARC");
    }else{
      System.out.println("ABC");        
    }




  }
} Main public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String N=sc.next();
    if(N.equals("ABC")){
      System.out.println("ARC");
    }else{
      System.out.println("ABC");        
    }




  } main {
    Scanner sc = new Scanner(System.in);
    String N=sc.next();
    if(N.equals("ABC")){
      System.out.println("ARC");
    }else{
      System.out.println("ABC");        
    }




  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String N=sc.next(); N sc.next() sc.next sc if(N.equals("ABC")){
      System.out.println("ARC");
    }else{
      System.out.println("ABC");        
    } N.equals("ABC") N.equals N "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" String[] args args
import java.util.Scanner;
import java.util.Arrays;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String N=sc.next();
    if(N.equals("ABC")){
      System.out.println("ARC");
    }else{
      System.out.println("ABC");        
    }




  }
}
