I am having trouble figuring out how to write a code to complete this assignment in Python: Implement the build_dictionary() function to build a word frequency dictionary from a list of words.

Ex: If the words list is:

["hey", "hi", "Mark", "hi", "mark"]
the dictionary returned from calling build_dictionary(words) is:

{'hey': 1, 'hi': 2, 'Mark': 1, 'mark': 1}
Ex: If the words list is:

["zyBooks", "now", "zyBooks", "later", "zyBooks", "forever"]
the dictionary returned from calling build_dictionary(words) is:

{'zyBooks': 3, 'now': 1, 'later': 1, 'forever': 1}
The main code builds the word list from an input string, calls build_dictionary() to build the dictionary, and displays the dictionary sorted by key value.

Ex: If the input is:

hey hi Mark hi mark
the output is:

Mark: 1
hey: 1
hi: 2
mark: 1

This is what I have been given:

# The words parameter is a list of strings.
def build_dictionary(words):
# The frequencies dictionary will be built with your code below.
# Each key is a word string and the corresponding value is an integer
# indicating that word's frequency.

'''your code goes here'''

# The following code asks for input, splits the input into a word list,
# calls build_dictionary(), and displays the contents sorted by key.
if __name__ == '__main__':
words = input().split()
your_dictionary = build_dictionary(words)
sorted_keys = sorted(your_dictionary. keys())
for key in sorted_keys:
print(key + ': ' + str(your_dictionary[key]))