'use strict';
function main(input) {
  let textAmount = input[0]*1;
  let textArr = input[1].split(" ");
  let text1 = textArr[0];
  let text2 = textArr[1];
  let ans = "";
  for(let i = 0; i < textAmount; i++){
    ans += text1[i];
    ans += text2[i];
  }
  console.log(ans);
}
main(require('fs').readFileSync('/dev/stdin', 'utf8').trim().split("\n"))
