def CheckNull(string):
    while True:
        if len(string) == 0:
            return True
        else:
            return False


def CheckRps(hand):
    handLower = hand.lower()
    acesptedHands = {"rock" : 1, "r" : 1, "paper" : 2, "p" : 2, "scissors" : 3, "s" : 3}
    if handLower in acesptedHands:
        return acesptedHands[handLower]
    else:
        return 0

def winORLoss(playerHand, ai):
    if playerHand == ai:
        return 0
    if playerHand == 1 and ai == 3 or playerHand == 2 and ai == 1 or playerHand == 3 and ai == 2:
        return 1
    return -1

def isNumber(target):
    if target.isdigit():
        return True
    return False