Create a python file digits.py and implement/write 3 functions definitions that take an integer parameter as an argument and do the following:

a. function first Digit(n) returns the first digit of the integer n (3 points)

b. function lastDigit(n) returns the last digit of the integer n (3 points)

c. function digits(n) returns the total number of digits in the integer n, (3 points)