You are given a number with duplicate digits your task is to remove the immediate duplicate digits and print the result

You are given a number with duplicate digits your task is to remove the immediate duplicate digits and print the result

Sample Input :
1331

Sample Output :
11

const readline = require('readline');
 const inp = readline.createInterface({
  input: process.stdin
 });
 const userInput = [];
 inp.on("line", (data) => {
 userInput.push(data);
 });
 inp.on("close", () => {
 var data = userInput[0].split(" ");
 var a = (data);
 var b=data.join(' ');
 var c=b.split("")
 
 for(i=0;i<c.length;i++)
  
  {if(c[i]==c[i+1])
     c.splice(i,2)
  }
  
  d=c.join("")
 console.log(d)
 });