Numbers

A non-negative integer is K-digit, if it can be written using K digits, but (K-1) digits are not enough for this. For example, 43 is a two-digit number, 2010 is four-digit, and 0 and 5 are one-digit numbers.

For given A and B count, how many K-digit non-negative integers exist, where K is not less than A and not greater than B.

Input

The only line contains integers A and B. 1 ≤ A ≤ B ≤ 1000.

Output

Output the answer to the problem without excessive leading zeros.

Examples