Distinct Digits

Description:

Input:

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

Output:

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

Sample Input:

121 130

Sample Output:

123

Sample Input:

98766 100000

Sample Output:

-1

Note:

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.