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 9.2.1) (judge verdict: Wrong Answer)

main(){int a,b,c,e,d=0,i;scanf("%d%d%d",&a,&b,&c); 
for(i=0;i<b-1;i++){scanf("%d",&e);d+=e;}
if(d>=a*c){puts("0");}else if(a*c-d>b){puts("-1");}else{printf("%d"),a*c-d;}}