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>

#include<math.h>
#include<string.h>
#include<ctype.h>

	int main ()
	{

   int a,b,c,d,e,t,i,j,k,n,sum=0,mi=0 ;
   char ch ;
   float g,h ;
  char s[100001] ;
gets(s) ;
if(s[1]=='B')
    printf("ARC") ;
else
    printf("ABC") ;



		return 0;


	}