Unique Chars In First Not Second

Return unique chars in s1 but not s2. Example: "water","watch" => {'e','r'}

Your task

Implement this function:

def unique_chars_present_in_first_not_in_second(s1: str, s2: str) -> set:

Write the function only — the arguments are read for you and the return value is printed automatically.

Arguments arrive as one Python literal per line, in this order: s1, s2.

Example

Input

'water'
'watch'

Output

{'e', 'r'}