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>
int main(void){
    char s[3];
    
    scanf("%c",&s[0]);
    scanf("%c",&s[1]);
    scanf("%c",&s[2]);
    
    if(s[1]=='B'){
        s[1]='R';
    }else{
        s[1]='B';
    }
    
    printf("%c%c%c\n",s[0],s[1],s[2]);
    
    return 0;
}