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() {
   char a,b,c;
   scanf("%c %c %c",&a,&b,&c);
    if(a=='A'&&b=='B'&&c=='C'){
    printf("ARC\n") ;
    }
    else if(a=='A'&&b=='R'&&c=='C')
    {
        printf("ABC\n") ;
    }
  return 0;
}