Description

Given a two-digit number, the sum of its tens and units digits is $a$, and the difference between the tens and units digits (larger minus smaller) is $b$. Can you determine what this two-digit number is?

Input Format

The first line contains two integers $a$ and $b$ ($1≤a≤18$, $0≤b≤9$).

Output Format

Output a single line containing an integer, representing the two-digit number. If there are multiple solutions, output the smallest one.

Sample

3 1

12