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)

a,b,c=(int(x) for x in input().split())
s = list(map(int, input().split()))
t = 0
for x in s:
  t += x
l = a + 1
chk = l * c
chk -= t
if chk > b:
  print(-1)
elseif chk < 0:
  print(0)
else:
  print(chk)