function Main (input) {
  input = input.split("\n");
  input[1] = input[1].split(" ");
  var N = parseInt(input[0], 10);
  var S = input[1][0].split("");
  var T = input[1][1].split("");
  var ans = "";
  for (var i = 0; i < N; i++) {
    ans += S[i];
    ans += T[i];
  }
  console.log(ans);
}

Main(require("fs").readFileSync("/dev/stdin", "utf8"));