#!/bin/bash
':' /*
docker run --rm -it -v $(cd $(dirname $0) && pwd):/vo:ro node:5.2-slim \
  /bin/bash -c "node /vo/$(basename $0) < /vo/g.inp"; exit $?
exit 0
*/

"use strict";

const main = (input) => {
  let n = Number.parseInt(input[0]);
  let st = input[1].split(" ");
  let ans = "";
  for(let i=0; i<n; i++){
    ans += st[0].charAt(i);
    ans += st[1].charAt(i);
  }
  return ans;
};
console.log(main(require("fs").readFileSync("/dev/stdin", "utf-8")
  .trim().split("\n")));
