Problem G. Gablerd Lettres ≡

Statement

Arocdnicg to rsceearch at Cmabrigde Uinervtisy, it deosn’t mttaer in waht oredr the ltteers in a wrod are, the olny iprmoatnt tihng is taht the frist and lsat ltteer are in the rghit pcale. The rset can be a toatl mses and you can sitll raed it wouthit pobelrm. Tihs is buseace the huamn mnid deos not raed ervey lteter by istlef, but the wrod as a wlohe.

Alexey decided to test whether this property will also hold for integers. He picked an integer number N and now wants to rearrange its digits so that:

• first and last digit stay in their places;
• all other digits change their positions.

Additionally for each position except the first and the last one, digits located in this position before and after rearrangement must be different.

You program must rearrange digits of a given integers according to Alexey's requirements.

Input file format

Input file contains a single integer N.

Output file format

Output file must contain a single integer — an answer to the problem. If there are several solutions, output any of them.

If there is no solution, output  − 1.

Constraints

1 ≤ N ≤ 10⁹

Sample tests

238965

269385

123

-1