active = True
while(active):
    print("Please enter a positive integer!\nEnter 'quit' to end the program.")
    try:
        resp = input()
        if resp == 'quit':
            active = False
        else:
            resp = int(resp)
            if resp<1 or resp >100:
                print('数字合法')
                continue
            if resp%8 == 0:
                print(f'{resp} is a multiple of 8.')
            else:
                print(f'{resp} is not a multiple of 8.')
    except TypeError:
        continue