'use strict'
function main(input) {
  const args = input.split('\n')
  const num = parseInt(args[0])
  const str = args[1].split(' ')
  const str1 = str[0].split('')
  const str2 = str[1].split('')
  let out = ''
  for (let i = 0; i < num; i++) {
    out += str1[i]
    out += str2[i]
  }
  
  console.log(out)
  
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));