def contains_word(to_be_checked: str, word: str) -> bool:
    word_len: int = len(word)
    word_character_number: int = 0
    for c in to_be_checked:
        if c != word[word_character_number]:
            word_character_number = 0
            continue
        if word_character_number == word_len - 1:
            return True
        word_character_number += 1
    return False

file = open('shakespeare.exp', 'r', encoding='utf8')
result = []
line_number = 0
for line in file:
    if contains_word(line, 'Hamlet'):
        result.append(line_number)
    line_number += 1
print(result)