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> 

int main(void)
{
    // int x;
    // scanf("%d", &x);
    // printf("%d\n", x);

    // long x;
    // scanf("%ld", &x);
    // printf("%ld\n", x);

    // char array[x];

    char str[3];
    scanf("%s", str);

    if (strcmp(str,"ABC")==0)
        puts("ARC");
    
    if (strcmp(str,"ARC")==0)
        puts("ABC");
    
    return 0;
}