d-gdc, 71 bytes

Result

WA

Code [DL]

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

stdin

0442710795528181750119773834913700863608466123471148438351935678381064690262281868515961930016929938

stdout

stderr

/tmp/code.d:1:32: error: function declaration without return type. (Note that constructors are always named 'this')
 import std.stdio,std.array;main(){write(split(readln(),"").sort.join);}
                                ^
/tmp/code.d:1:34: error: no identifier for declarator main()
 import std.stdio,std.array;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