Problem:
Score : 100 points

Problem Statement

Given is a lowercase English letter C that is not z. Print the letter that follows C in alphabetical order.

Constraints

C is a lowercase English letter that is not z.

Input

Input is given from Standard Input in the following format:

C

Output

Print the letter that follows C in alphabetical order.

Sample Input 1

a

Sample Output 1

b

a is followed by b.

Sample Input 2

y

Sample Output 2

z

y is followed by z.

Solution in C (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <stdio.h>
int main(void){
	int n,k,m,i,sum=0;
	scanf("%d%d%d",&n,&k,&m);
	int a[n+1];
	for(i=0;i<n;i++){
		scanf("%d",&a[i]);
		sum+=a[i];
	}
	if(sum+k<n*m) printf("-1");
	else if(sum>=n*m) printf("0");
	else printf("%d",n*m-sum);
	return 0;
}