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.

Examples

Input

a


Output

b


Input

y


Output

z
ch = raw_input()
if(ch.lower() != 'z' and len(ch) == 1):
  output = ord(ch) + 1
  print(chr(output).lower())
else: 
  print("Invalid")