Using Python write the following functions and provide a program to test them (main and all functions in one py) def firstDigit(n) (returning the first digit of the argument) def lastDigit(n) (returning the last digit of the argument) def digits(n) (returning the number of digits of the argument) For example, fustDigit(7864) is 7. lastDigit(7864) is 4, and digits(7864) is 4. 1) code with comments, please screenshot code