I’m trying to write a solution for UVa 860, but when I send it through vJudge it keeps saying “Runtime Error”.

from sys import stdin

import math

def main():

end_of_input = False
lambda_words = 0
dictionary = {}
text_entropy = 0
relative_entropy = 0

    while not end_of_input:
        line = stdin.readline().strip()
        if line == "****END_OF_INPUT****":
            end_of_input = True
    else:
        if line == "****END_OF_TEXT****":
            print("%s %.1f %d" % (lambda_words, text_entropy, relative_entropy))
            # print(lambda_words, round(text_entropy, 1), round(relative_entropy))
            dictionary = {}
            lambda_words = 0
            text_entropy = 0
            relative_entropy = 0
        else:
            line = line.replace(',', ' ')
            line = line.replace('.', ' ')
            line = line.replace(':', ' ')
            line = line.replace(';', ' ')
            line = line.replace('!', ' ')
            line = line.replace('?', ' ')
            line = line.replace('"', ' ')
            line = line.replace('(', ' ')
            line = line.replace(')', ' ')
            line = line.lower()
            words = line.split()
            lambda_words += len(words)
            for word in words:
                if word in dictionary:
                    dictionary[word] += 1
                else:
                    dictionary[word] = 1
            text_entropy = 0
            for word in dictionary:
                text_entropy += dictionary[word]*(math.log10(lambda_words) - math.log10(dictionary[word]))
                
            text_entropy = text_entropy / lambda_words
            max_entropy = math.log10(lambda_words)
            relative_entropy = (text_entropy / max_entropy) * 100
return 0

main()

I’ve tried almost everything, I’ve checked the different types of error in Python and nothing seems to help.
I’m needing a hand, hope you could help me! 🙂