def find_longest(list_of_words):
    return len(max(list_of_words, key=len))

def flush_right(list_of_words, file_name):
    n = find_longest(list_of_words) +3

    with open(file_name,'w') as file:
      for word in list_of_words:
        file.write(word[::-1].rjust(n) + '\n')


def main():
    list_of_words = ["Ala", "ma", "kota"]
    name_of_file = 'test.txt'
    flush_right(list_of_words, name_of_file)

if __name__ == "__main__":
    main()