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 Python (3.4.3) (judge verdict: Runtime Error)

N,K,M = input().split()
N = int(N)
K = int(K)
M = int(N)
A = input().split()
A = [int(s) for s in A]
AN = M * N - sum(A)
if (AN <= K) and (AN >= 0):
	print (AN)
else:
	print ('-1')