We will buy a product for N yen (the currency of Japan) at a shop.  If we use only 1000-yen bills to pay the price, how much change will we receive?  Assume we use the minimum number of bills required.
n = int(input())
print(n%1000)
n = int(input())
if n%1000 > 0:
    print(1000-n%1000)
else:
    print(0)