php, 50 bytes

Result

WA

Code [DL]

<?php $a=str_split(readline());sort($a);echo "".$a

stdin

4118879327833068340575195300170194199839131198924290034077536500645238922218200156065946075111042887

stdout

stderr

PHP Parse error:  syntax error, unexpected end of file, expecting ',' or ';' in /volume/CODE on line 1

strace