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.util.*;

public class Main
{
	public static  void main(String args[])
	{
		Scanner scan = new Scanner(System.in);
		String w1 = scan.nextLine();
		String w2="ABC";
		if(w1.equals(w2))
		{
			System.out.println("ARC");
		}
		else
			System.out.println("ABC");
	}
}