Envío 4261

Código

var readline = require('readline');
var rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
});
var res = "";
var bn;
var carry;
rl.on("line", function(line) {

if(bn === undefined){bn = line; return;}

carry = parseInt(line);
for(var i = bn.length-1; i >= 0 ; i--){
var current = parseInt(bn[i]) + carry
res = (current%10) + res
if(current > 9){
carry = 1;
}else{
carry = 0;
}
}
console.log((carry > 0? carry :"")+res)
});