AtCoder Inc. holds a contest every Saturday.

There are two types of contests called ABC and ARC, and just one of them is held at a time.

The company holds these two types of contests alternately: an ARC follows an ABC and vice versa.

Given a string S representing the type of the contest held last week, print the string representing the type of the contest held this week.

Constraints

* S is `ABC` or `ARC`.

Input

Input is given from Standard Input in the following format:


S


Output

Print the string representing the type of the contest held this week.

Example

Input

ABC


Output

ARC
import java.math.BigInteger;
import java.util.Scanner;
class  Main{
  public   static  void main(String[]args){
Scanner in =new Scanner(System.in);
String s;
s=in.next();
if (s.equals("ABC"))
  System.out.print("ARC");
else  System.out.print("ABC");





  }
}