function Main (input) {
  input = input.split("\n");
  var N = parseInt(input[0], 10);
  var o1 = input[1].split(" ");
  var S = o1[0];
  var T = o1[1];

  var i = 0;
  var ans = "";
  while (N > i) {
    var o2 = String(S.slice(i, i+1)) + String(T.slice(i, i+1));
    ans = ans + o2;
    i++
  }
  console.log(ans);
}

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