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 C (Clang 10.0.0) (judge verdict: Accepted)

#include<stdio.h>
#include<string.h>

int main(void) {

	char aContest[4];
	//文字列を入力
	scanf("%s", &aContest);
	//入力される文字列に応じた文字列を表示
	if (strcmp(aContest, "ABC") == 0) {
		printf("\nARC\n");
	}
	else if (strcmp(aContest, "ARC" )== 0) {
		printf("\nABC\n");
	}else{}

	return 0;
}