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 sc = new Scanner(System.in);
		// 文字列の入力
		String lineString = sc.nextLine();

		// 出力
		System.out.println(lineString.equals("ARC") ? "ABC" : "ARC");
		sc.close();
	}
}
