node, 49 bytes

Result

WA

Code [DL]

f=require(`fs`);f.write(f.readFileSync(0).sort())

stdin

6541103190477962851668125096786720689486182901488523981886110598476796821470161735839693321606329657

stdout

stderr

fs.js:730
  return binding.writeString(fd, buffer, offset, length, req);
                 ^

TypeError: First argument must be file descriptor
    at Object.fs.write (fs.js:730:18)
    at Object.<anonymous> (/volume/CODE:1:81)
    at Module._compile (module.js:571:32)
    at Object.Module._extensions..js (module.js:580:10)
    at Module.load (module.js:488:32)
    at tryModuleLoad (module.js:447:12)
    at Function.Module._load (module.js:439:3)
    at Module.runMain (module.js:605:10)
    at run (bootstrap_node.js:427:7)
    at startup (bootstrap_node.js:148:9)

strace