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: Wrong Answer)

#include<stdio.h>
 main(){ 
	int N,K,i,j,k,l;
	scanf("%d %d",&N,&K);
	int a[200][200];
	int d[200],p[200];
	for(i=1;i<K+1;i++){
	scanf("%d",d[i]);	
		for(j=1;j<d[i]+1;j++){
        scanf("%d",&a[i][j]);
        k=a[i][j];
		p[k]++;		}
		
		}
	for(k=1;k<=N;k++){
			if(p[k]=0)
			 printf("%d/n",k);
	}
 }