A. Distinct Digitstime limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard outputYou 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.InputThe first line contains two integers l and r (1 \le l \le r \le 10^{5}).OutputIf an answer exists, print any of them. Otherwise, print -1.ExamplesInput
121 130
Output
123
Input
98766 100000
Output
-1
NoteIn the first example, 123 is one of the possible answers. However, 121 can't be the answer, because there are multiple 1s on different digits.In the second example, there is no valid answer.
121 130

123 
['brute force', 'implementation', '*800']