How many decimal places

Problem to find the How many number after the decimal.

Example-1:

Input    : n = "3.1415"
Output   : 4

Example-2:

Input    : n = "3.200"
Output   : 3

Example-3:

Input    : n = "300"
Output   : 0

Solution

a = 3.1415

b = str(a)[::-1]

if "." in b:

    c = b.index('.')

    print(c)

else:

    print('0')

Output