function Main(input) {
  input = input.split("\n");
  var a = input[0];
  input = input[1].split(" ");
  var ans = "";
  for(var i=0;i<a;i++){
    ans+=input[0].charAt(i);
    ans+=input[1].charAt(i);
  }
  console.log(ans);
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));