dice = ["1", "2", "3", "4"]

def parse_input(input_string):
    if input_string.strip() in dice:
        return int(input_string)
    else:
        print(f"Please enter a number from {dice[0]} to {dice[-1]}.")
        raise SystemExit(1)

num_dice_input = input(f"How many dice do you want to roll? [{dice[0]}-{dice[-1]}] ")
num_dice = parse_input(num_dice_input)
print(num_dice)