php, 49 bytes

Result

WA

Code [DL]

<?=($a=str_split(*readline))|sort($a)?join($a):0;

stdin

6448820881938261321421830748867498543472099152205532092069676871748842002159653174459615338152618698

stdout

stderr

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

strace