Question

Compute nearest larger number by interchanging digits updated.

Given 2 numbers a and b find the smallest number greater than b by interchanging the digits of a and if not possible print -1.

Constraints
1 <= a,b <= 10000000

Input Format
2 numbers, a and b, separated by space.

Output
A single number, greater than than b.

If not possible, print -1.

Test Case

Explanation
Example 1

Input

459 500

Output

549

Example 2

Input

645757 457765

Output

465577

Example 3

Input

5964 9984

Output

-1

Answer 1

Answer:

I don't know answer please mark me as brainiest

Answer 2

Answer:

i don't know the answer of this type of questions