Maximize the First Number

Write a function that makes the first number as large as possible by swapping out its digits for digits in the second number.

To illustrate:

max_possible(9328, 456) ➞ 9658
# 9658 is the largest possible number built from swaps from 456.
# 3 replaced with 6 and 2 replaced with 5.

Examples

max_possible(523, 76) ➞ 763

max_possible(9132, 5564) ➞ 9655

max_possible(8732, 91255) ➞ 9755

Notes

• Each digit in the second number can only be used once.
• Zero to all digits in the second number may be used.