Distinct Digits

题意翻译

你有两个正整数 $ l $ 和 $ r $ ($1\leq l\leq r\leq 10^5$),请你找出一个满足下列两个条件的正整数 $x$ : - $l\leq x\leq r.$ - $x$这个数的各个数位上的数值均不相同 假如有多个满足条件的解 $x$ ,输出任意一个均可。如果没有满足条件的解,那么输出$-1$。

题目描述

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.

输入输出格式

输入格式


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

输出格式


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

输入输出样例

输入样例 #1

121 130

输出样例 #1

123

输入样例 #2

98766 100000

输出样例 #2

-1

说明

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.