"use strict";
process.stdin.resume();
process.stdin.setEncoding("utf-8");

function print(x) {
  console.log(x);
}

let inputString = "";
let currentLine = 0;

process.stdin.on("data", inputStdin => {
  inputString += inputStdin;
});
process.stdin.on("end", () => {
  inputString = inputString.split("\n");
  main();
});
function readline() {
  return inputString[currentLine++];
}

// ************************ Ignore above this Line ******************************
// **************************** Main Code Start *********************************

function main() {

  var T = parseInt(readline());
  var str = readline().split(" ");
  var a = str[0], b = str[1];

  var s1 = "";
  var L = b[b.length - 1];

  for (var i = 0; i < a.length; i++) {
    s1 += a[i];
    for (var j = 0; j < L.length; j++) {
      s1 += b[j];
    }
  }
  print(s1);

}
