Can someone do this python program?

Create a function that takes in a string as a parameter. Then create a dictionary of characters to integers, where the integer represents how many times the number of times the character appears in the word.

Create a function that takes two lists as parameters and returns the elements they have in common of the two lists.

Ask the user to create a list of numbers and keep asking them for entries until they enter a negative number. Then print the list and return the size of the list.