Question Part 1: Define a function that takes a list as an argument. The function should return the sum of all the numbers in the list. If the list has some elements that are not numbers, exclude them from the calculation.

Question Part 2: Assuming the above question is answered correctly, and the function is named listSum Define a function that takes three lists as arguments, calculates their sum using listSum, and returns the highest value of the three returned values.

#it's need to be solved by python programming language.