Need help implementing an input with file operations

[Gaijin]

Hello Guys,

I am stuck on an assignment. I have done most of the work but the third step is giving me problem. So the third step is suppose to find a twitter handle or (username) with @, so it can be @anyone, any@ or @any@any@. It is suppose to report how much occurrences it finds when I type in the handle for ex. @spacex.

My problem is my output is not matching with the expected output.

Here's my code (relevant parts):

def cleanedup(s):
    alphabet = "abcdefghijklmnopqrstuvwxyz@"
    cleantext = ""
    s = s.replace("?s", "")
    s = s.replace("'s", "")
    for character in s.lower():
        if character in alphabet:
            cleantext += character
        else:
            cleantext += ""
   return cleantext

dictionary = {}
with open("elon-musk.txt") as file:
    for tweet in file:
        for word in tweet.lower().split():
            word = cleanedup(word)
            if "@" in word:
                if word in dictionary.keys():
                    dictionary[word] += 1
                else:
                    dictionary[word] = 1

while True:
    username = input("Enter username: ")
    if username in dictionary:
        print("Mentioned", (dictionary[username]), "times.")
    else:
        print("Not found")

Output should be:

Enter username: @spacex
Mentioned 187 times.
Enter username: @nasa
Mentioned 41 times.

I get:

Enter username: @spacex
Mentioned 187 times.
Enter username: @nasa
Mentioned 40 times.

So my question is what is wrong with my code that its skipping over the last mention for @nasa? Also Is there any simpler way of doing this? Without s.replace()? I need to get it as simple since that is my assignment constraints.

elon-musk.txt

Gribouillis write Jun-08-2022, 06:49 PM:
I reverted the last edit in this post, please read carefully the forum's policy regarding Editing and deleting threads/posts/account, especially the paragraph about students attempting to delete their posts.