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 (GCC 9.2.1) (judge verdict: Accepted)

#include<stdio.h>
#define REP(i,n) for (int i = 0 ; i < (int)n ; i++)
typedef long long ll;

int main(){
    char a[3];
    scanf("%c%c%c",&a[0],&a[1],&a[2]);

    if(a[1] == 'R'){
        printf("ABC\n");
    }else
    {
        printf("ARC\n");
    }
    
}