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>

int main(void)
{
  char str[4]; //'A','B','c','\0'
  scanf("%s",str);
  
  if(str[0] == 'A' && str[1] == 'B' && str[2] == 'C')
    printf("ARC\n");
  else if(str[0] == 'A' && str[1] == 'R' && str[2] == 'C')
    printf("ABC\n");
  
  return 0;
}