import random, sys

places = ('airstrip', 'forest', 'cave')
transitions = {
    'airstrip' : ('forest',),
    'forest' : ('airstrip', 'cave'),
    'cave' : ('forest',),
}
place = random.choice(places)

while True:
    print 'You are at the', place
    destinations = transitions[place]
    print 'From here you can go to', ', '.join(destinations)
    newDest = raw_input('Where would you like to go? ')
    if newDest == 'quit':
        break
    if newDest in destinations:
        if random.randint(1,10) == 1:
            print 'You were struck by lightning. Game over.'
            sys.exit()
        place = newDest
    else:
        print "You can't go there."