def ex8():

    import random

    option = -1
    print("Welcome to an exciting game of rock, paper and scissors. \n0.Exit\n1. Rock\n2.Papper\n3.Scissors")

    while(option != 0):
        option = int(input(("Please enter your option: ")))
        if((type(option)!= int) or (option < 0 or option > 3)):
            print("Invalid option!")
        machine = random.randint(1,3)

        if(option == 1):
            if(machine == 1):
                print("Draw!")
            elif(machine == 2):
                print("You lost! Paper beats rock!")
            elif(machine == 3):
                print("You win! Rock beats scissors!")
        elif(option == 2):
            if(machine == 1):
                print("You win! Papper beats rock!")
            elif(machine == 2):
                print("Draw!")
            elif(machine == 3):
                print("You lose! Scissors beat paper!")
        elif(option == 3):
            if(machine == 1):
                print("You lose! Rock beats scissors!")
            elif(machine == 2):
                print("You win! Scissors beat paper")
            elif(machine == 3):
                print("Draw!")
        elif(option == 0):
            print("See you next time!")