In python please, Must use while loops and no max, min, ect functions

Complete the following functions defined in the code below. get grades0 should iterate with a while loop to put all positive values into a list called grades until encountering a negative value average0 should return the average of all the values in grades list. If grades is empty, average should be zero. maximum0 should return the maximum grade in grades list. If grades is empty, maximum should be zero. minimum0 should return the minimum grade in grades list. If grades is empty, minimum should be zero. print grades0 should print the grades each on a separate line. It should not print in list format Example main output Enter grade: Enter grade: Enter grade: Grades: 83 92 27 Average: 64.25 Max: 92 Min: 27 main.py Load default template... 1 def average(grades): pass 4 def maximum(grades): pass 7 def minimum (grades): pass 10 def print grades (grades): pass 12 13 def get_grades() 14 15 16 def main(): 17 18 19 20 21 pass grades-get_grades () print_grades (grades) print("Average:", average(grades)) print("Max:", maximum(grades)) print("Min:", minimum(grades)) 23 24 if-name 25 26 , main-.. main()