
import Foundation

func main(){
   let n = Int(readLine()!)!
   let line = readLine()!.split(separator: " ")
   
   let s = Array(line[0])
   let t = Array(line[1])
   
   var answer = ""
   for i in 0..<n {
      answer += "\(s[i])\(t[i])"
   }
   print(answer)
}
main()