Как создать функцию, использующую циклы для возврата количества прописных и строчных букв в Python?

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m a beginner and am having trouble with this question: Create a function that receives a string input from the user and returns the number of upper case letters, lower case letters, as well as converting the string to Title Case. The input and print commands should be part of the main program.

should use str.islower(), str.isupper(), str.istitle()

What I have tried:

#Enter user input

string = input("Please enter a string: ")
def count(string):

    d = {"upper":0, "lower":0} #Monitor upper and lower case count
    for str in string:
        if str.isupper():
           d["upper"]+=1
        elif str.islower():
           d["lower"]+=1
        else:
           pass

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