Max Value in Range

Background

Congcong is currently learning about number comparison and conditional statements. He encountered an interesting problem that requires finding a number from two given numbers that meets specific criteria.

Problem Description

Given two positive integer values, return the larger value that is in the range $10 \dots 20$ inclusive, or return $0$ if neither is in that range.

Input Format

Input is given from standard input in the following format.

$a$ $b$

Output Format

Output is printed to standard output in the following format.

result

Sample

11 19

19

19 11

19

11 9

11

Sample Explanation

For the first sample, the input is $11$ and $19$. Both numbers are within the range $10$ to $20$, so the larger value, $19$, is returned. For the third sample, the input is $11$ and $9$. Only $11$ is within the range $10$ to $20$, so $11$ is returned.

Constraints

Time limit: $1$ second, Memory limit: $1024$ KiB for each test case.