largest = None
smallest = None

while True:
    num = input('enter a number:')
    if num == 'done':
        break
    try:
        int_num = int(num)
    except ValueError:
        print('enter a valid number')
        continue

    if smallest is None:
        smallest = int_num
    elif int_num < smallest:
        smallest = int_num

    if largest is None:
        largest = int_num
    elif int_num > largest:
        largest = int_num

print('smallest', smallest)
print('largest', largest)