php, 52 bytes

Result

WA

Code [DL]

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

stdin

9020358538398834034649204138643738399058074385350794731307171116530605400247453013639433753117304620

stdout

stderr

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

strace