node, 74 bytes

Result

WA

Code [DL]

console.log(require('fs').readFileSync(0,'euc').split("").sort().join(""))

stdin

5463672702568148064457989329414402075856289380540784560125559047142723492142607136295726184486442611

stdout

stderr

internal/fs.js:20
    throw new Error(`Unknown encoding: ${encoding}`);
    ^

Error: Unknown encoding: euc
    at assertEncoding (internal/fs.js:20:11)
    at getOptions (fs.js:58:5)
    at Object.fs.readFileSync (fs.js:489:13)
    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)

strace