d-gdc, 66 bytes

Result

WA

Code [DL]

import std.stdio;void main(){write(split(readln(),"").sort.join);}

stdin

6852532627513199241457431187697941026306910539629159181114324671084814857045165432427532049172411565

stdout

stderr

/tmp/code.d:1:36: error: undefined identifier split
 import std.stdio;void main(){write(split(readln(),"").sort.join);}
                                    ^
/home/esolang/bin/d-gdc: line 6: /tmp/code: No such file or directory
rm: cannot remove '/tmp/code': No such file or directory

strace