Python3:Returns the number of minutes since midnight.

def str_to_minutes(s): """ Returns the number of minutes since midnight. If s does not represent a time, this function returns -1. Examples: time_to_minutes('2:45 PM') returns 885 time_to_minutes('9:05 AM') returns 545 time_to_minutes('12:00 AM') returns 0 time_to_minutes('12:75 AM') returns -1 time_to_minutes('apple') returns -1 Parameter s: a string potentially representing a time Precondition: s is non-empty """