'use strict';
function main(input) {
  const arr = input.trim().split('\n');
  const a = NUmber(arr[0]);
  const b = arr[1].split(' ')[0];
  const c = arr[1].split(' ')[1];
  let str = '';
  
  for (let i = 0; i < a; i ++) {
    str += (b[i] + c[i]);
  }
  
  console.log(str);
}

main(require("fs").readFileSync("/dev/stdin", "utf8"));