"use strict";

function main(input) {
  input = input.trim().split("\n");
  const N = Number(input[0]);
  let line2 = input[1].split(" ");
  let ans = [];
  for (let i = 0; i < N; i++) {
    ans.push(line2[0].split("")[i]);
    ans.push(line2[1].split("")[i]);
  }
  console.log(ans.join(""));
}

main(require("fs").readFileSync("/dev/stdin", "utf-8"));
