String Reorder

Your task is to reorder the characters of a string so that no two adjacent characters are the same. What is the lexicographically minimal such string?

Input

The only line has a string of length n consisting of characters A–Z.

Output

Print the lexicographically minimal reordered string where no two adjacent characters are the same. If it is not possible to create such a string, print -1.

Constraints

$1 \le n \le 10^6$

Example

Input

HATTIVATTI

Output

AHATITITVT