main.py

VALID_CARDS = [2, 3, 4, 5, 6, 7, 8, 9, 10, 'Jack', 'Queen', 'King', 'Ace']

def blackjack_score(hand):
    score = 0
    
    if len(hand) > 5:
        return "Invalid"

    for card in hand:
        if card not in VALID_CARDS:
            return "Invalid"
        
        if card in ["Jack", "King", "Queen"]:
            score += 10
        elif isinstance(card, int):
            score += card
        elif card in ["Ace"] and score <= 10:
            score += 11
        elif card in ["Ace"] and score > 10: 
            score += 1

    if score > 21:
        if "Ace" in hand:
            score -= 10
        else: 
            return "Bust"

    return score