In this kata you will have to change every letter in a given string to the next letter in the alphabet. You will write a function `nextLetter` to do this. The function will take a single parameter `s` (string).
Examples:
```
"Hello" --> "Ifmmp"
"What is your name?" --> "Xibu jt zpvs obnf?"
"zoo" --> "app"
"zzZAaa" --> "aaABbb"
```
Note: spaces and special characters should remain the same. Capital letters should transfer in the same way but remain capitilized.
from string import ascii_lowercase as L, ascii_uppercase as U

def next_letter(s):
    return s.translate(str.maketrans(L + U, L[1:] + L[0] + U[1:] + U[0]))
from string import ascii_lowercase as L, ascii_uppercase as U

def next_letter(s):
    return s.translate(str.maketrans(L + U, L[1:] + L[0] + U[1:] + U[0]))