function main(input) {
  var lines = input.split("\n")
  var n = lines[0]*1
  var str = lines[1].split(" ")

  var result = ""
  for (var i = 0; i < n; i++) {
    result = result + str[0][i] + str[1][i]
  }

  console.log(result)
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'))