'use strict'

function Main(input) {
  const N = input[0]
  const rest = input.trim().split('\n').slice(1).join()
  const array = rest.split(' ')
  const S = array[0]
  const T = array[1]
  let ans = ''
  for(let i = 0; i < N; ++i) {
    ans += S[i]
    ans += T[i]
  }

  console.log(ans)
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));