function Main(input) {
  const n = +input[0];
  const strs = input[1].split(' ');

  var answer = '';
  for (var i = 0; i < n; i++) {
    answer += strs[0][i];
    answer += strs[1][i];
  }

  console.log(answer);
}

Main(require("fs").readFileSync("/dev/stdin", "utf8").trim().split("\n"));