Problem:
Score : 100 points

Problem Statement

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.

Sample Input 1

ABC

Sample Output 1

ARC

They held an ABC last week, so they will hold an ARC this week.

Solution in Java (OpenJDK 11.0.6) (judge verdict: Wrong Answer)

public class Main {
    public static void main(String[] args) {
        long x = (1L << 32) - 1 ;
        long n = (int)1e8;
        long p = 1;

        for (int i = 1; i <= n; i++) {
            p += i;
            p %= x;
        }

        System.out.println(p);
    }   
}