VALUES = {'e': 1, 'a': 1, 'i': 1, 'o': 1, 'n': 1, 'r': 1,
          't': 1, 'l': 1, 's': 1, 'u': 1, 'd': 2, 'g': 2,
          'b': 3, 'c': 3, 'm': 3, 'p': 3, 'f': 4, 'h': 4,
          'v': 4, 'w': 4, 'y': 4, 'k': 5, 'j': 8, 'x': 8,
          'q': 10, 'z': 10}


def worth_of_words(words):
    highest_word = None
    highest_score = 0
    for word in words:
        score = word_score(word)
        if score > highest_score:
            highest_score = score
            highest_word = word
    return highest_word


def word_score(word):
    score = 0
    for letter in word:
        score += VALUES[letter]
    return score


if __name__ == '__main__':
    print("Example:")
    print(worth_of_words(['hi', 'quiz', 'bomb', 'president']))

    # These "asserts" using only for self-checking and not necessary for auto-testing
    assert worth_of_words(['hi', 'quiz', 'bomb', 'president']) == 'quiz'
    assert worth_of_words(['zero', 'one', 'two', 'three', 'four', 'five']) == 'zero'
    print("Coding complete? Click 'Check' to earn cool rewards!")