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A number is given as input.Find the maximum number that can be formed using the digits.

 A number is given as input.Find the maximum number that can be formed using the digits.
Input Size : N <= 10000000
Sample Testcase :
INPUT
4123
OUTPUT
4321

 

 
const readline = require("readline");

const inp = readline.createInterface({
  input: process.stdin
});

const userInput = [];

inp.on("line", (data) => {
  userInput.push(data);
});

inp.on("close", () => {
   

  var inp = userInput[0];
  var arr = inp.split("").map((val)=>Number(val))
  var sarr = arr.sort(function(a,b){return b-a});
  var ans  =sarr.join("")
  console.log(ans)

 
});

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