Two numbers

Two integers are given. Print the maximum number that can be obtained from their digits.

For example, from digits of numbers $345$ and $6090737$ we can get the maximum number $9776543300$.

Input

Two numbers $a$ and $b(1\le a,b\le 10^9)$ are given in one line.

Output

Print the biggest number that can be obtained from digits of numbers $a$ and $b$.

Examples