node, 48 bytes

Result

WA

Code [DL]

console.log(require(`fs`).readSync(0).sort()+'')

stdin

0503254993416599548687138459191706023000906717736124431149083750750868211788031894092229323618591376

stdout

stderr

buffer.js:125
    throw err;
    ^

TypeError: "size" argument must be a number
    at Function.Buffer.allocUnsafe (buffer.js:152:3)
    at Object.fs.readSync (fs.js:669:21)
    at Object.<anonymous> (/volume/CODE:1:89)
    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)

strace