function Main(input) {
  input = input.trim();
  input = input.split("\n")
  var mem = input[1].split(" ")
  var a=mem[0].split("");
  var b= mem[1].split("");
  for(var i=0;i<input[0];i++){
  process.stdout.write(a[i])
  process.stdout.write(b[i])
  }
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));
