def number_to_name(num):
    """ 
        Helper function that converts a number (0 to 4) into a name 
        representing one of the items of the program
    """
    name = ""
    if num == 0:
        name = "rock"
    elif num == 1:
        name = "Spock"
    elif num == 2:
        name = "paper"
    elif num == 3:
        name = "lizard"
    elif num == 4:
        name == "scissors"
    
    return name