tenCards = ['10', '9', '4', '1', '3', '4', 'J', 'J']
cards = {
    'A': 1,
    'J': 10,
    'Q': 10,
    'K': 10
}

for i, card in enumerate(tenCards):
    try:
        value = cards[card]
    except KeyError:
        value = card
    tenCards[i] = value

print(tenCards)