PLEASE, I need some help with this exercise: Thank you !!

5. Mrs. Keller had 55.4 inches of rain in her rain gage during Hurricane Harvey. An approximation that is used sometimes is that 1 inch of rain is equal to 6.45 inches of snow. Write a user-defined function called LastName_FirstName_Exam_Rain2Snow that does this conversion. Then write a script file that calculates and displays how much snow Mrs. Keller would have had at her home, had Hurricane Harvey produced snow. Finally, ask the user to input 3 different values for inches of rain and display both the input and output. Your input should be checked for legitimate values (i.e. it should be positive). Users should enter 3 different values before any calculations are done. Run your program several times to show that the user input checks are working and copy the results to the program