from random import randint

#pc choice

def get_computer_hand():
    r=randint(1,3)
    if r == 1:
        hand = "rock"
    elif r == 2 :
        hand = "paper"
    elif r == 3 :
        hand = "scissor"
    return hand

# men el kseb

def whowin(you,comp):
    if you == comp:
        winner = "tie"
    elif (comp == "rock" and you == "scissor") or (comp == "scissor" and you == "paper") or (comp == "paper" and you == "rock"):
        winner = "comp"
    else:
        winner = "you"
    return winner


# start

def play():
    print "------welcome to my game------"
    comp_wins = 0
    you_wins = 0
    tie_wins = 0
    while True:
        you = raw_input("Please choose rock or scissor or paper ")
        you=you.lower()
        if not you == "rock" or you == "paper" or you == "scissor" :
            print" invalid "
            continue
        comp = get_computer_hand()
        winner = whowin(you,comp)



play()