Tester.py

def modify(the_string):
    the_string = the_string.replace("5", "0")
    return the_string
def main():
    outer_string = "I have watched 5 movies."
    print(outer_string)
    modify(outer_string)
    print(outer_string)
    outer_string = modify(outer_string)
    print(outer_string)
main()

What is the output?
Be careful of the whitespace(space,newline) in your answer.