php, 51 bytes

Result

WA

Code [DL]

<?=($a=str_split(readline()))|sort($a)?implode($a);

stdin

2284925452077187690396033254971517701122947432200707478145628536522358037070322912133122970295319388

stdout

stderr

PHP Parse error:  syntax error, unexpected ';' in /volume/CODE on line 1

strace