7. Write a function that takes, as an argument, an object. Name this function convertUnits(feet). If the argument, feet, is an integer, it should convert the value to it's equivalent length in inches and return that value. If the argument, feet, is a string consisting of digits only, it should cast that string to an integer and return the equivalent length in inches. If the argument, feet, is a sequence of letters ONLY, it should return the string "Enter digits, not letters." Otherwise, it should return the string "I do not understand the input." Use the function you wrote in Problem 3 to distinguish between types of input. For example eet 100 "100" "vibbie" convertUnits(feet 1200 1200 "Enter digits, not letters." "I do not understand the input." "I do not understand the input." "I do not understand the input." ib4bie" 100.0 "100.0" To clarify what is expected in this assignment, your .py file should follow the following format