def card_value(card):
if card in ['2', '3', '4', '5', '6']:
return 1
elif card in ['7', '8', '9']:
return 0
elif card in ['10', 'J', 'Q', 'K', 'A']:
return -1
else:
return 0
def count_cards(cards):
count = 0
for card in cards:
count += card_value(card)
return count
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