30167번 - Distinct Digits 스페셜 저지다국어

문제

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.

입력

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

출력

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

제한

노트

In the first example, 123ドル$ is one of the possible answers. However, 121ドル$ can't be the answer, because there are multiple 1ドル$s on different digits.

In the second example, there is no valid answer.