csharp, 107 bytes

Result

WA

Code [DL]

using System;class C{static Main(){var p=Console.ReadLine().ToCharArray();Array.Sort(p);Console.Write(p);}}

stdin

5927864581017729218875421520170354687385077812405698359888390030891679369786360397129466932569060999

stdout

Compilation failed: 1 error(s), 0 warnings

stderr

/tmp/code.cs(1,29): error CS1520: Class, struct, or interface method must have a return type
Cannot open assembly '/tmp/code.exe': No such file or directory.
rm: cannot remove '/tmp/code.exe': No such file or directory

strace