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.

Difficulty: introductory

Starter code:

def next_letter(s):
	

Solutions:
def next_letter(string):
    return "".join(chr(ord(c)+(-25 if c in 'zZ' else 1)) if c.isalpha() else c for c in string)

def next_letter(s):
    return s.translate(str.maketrans('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ', 
    'bcdefghijklmnopqrstuvwxyzaBCDEFGHIJKLMNOPQRSTUVWXYZA'))

from string import ascii_lowercase as aLow

tr = aLow[1:]+'a'
TABLE = str.maketrans(aLow+aLow.upper(), tr+tr.upper())

def next_letter(s): return s.translate(TABLE)

table = {o+c: c+(o+1)%26 for c in (97, 65) for o in range(26)}

def next_letter(stg):
    return stg.translate(table)

# one-liner
#next_letter = lambda stg: stg.translate({o+c: c+(o+1)%26 for c in (97, 65) for o in range(26)})


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_letters as a, ascii_lowercase as al, ascii_uppercase as au
def next_letter(string):
    return string.translate(str.maketrans(a, al[1:] + al[0] + au[1:] + au[0]))

from string import ascii_lowercase as low, ascii_uppercase as up


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


from string import ascii_lowercase as l, ascii_uppercase as u
next_letter=lambda s:s.translate(str.maketrans(l+u,l[1:]+l[0]+u[1:]+u[0]))