CF1228A Distinct Digits

You have two integers $ l $ and $ r $ . Find an integer $ x $ which satisfies the conditions below: - $ l \le x \le r $ . - All digits of $ x $ are different. If there are multiple answers, print any of them.

The first line contains two integers $ l $ and $ r $ ( $ 1 \le l \le r \le 10^{5} $ ).

If an answer exists, print any of them. Otherwise, print $ -1 $ .

In the first example, $ 123 $ is one of the possible answers. However, $ 121 $ can't be the answer, because there are multiple $ 1 $ s on different digits. In the second example, there is no valid answer.