## rotate_suits: (listof (listof int str)) -> None
## Changes the suit of each card in a list of cards to be the suit of the 
## following card.
def rotate_suits(hand):
    values = map(lambda x: x[0], hand)
    suits = map(lambda x: x[1], hand)
    hand = zip(values, suits.append(hand[0][1])[1:])
L = [[9,"spades" ],[7,"clubs"],[9,"clubs"]]