p02801 AtCoder Beginner Contest 151 - Next Alphabet
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
```python
a = input()
b = chr(ord(a)+1)
print(b)
```