let n=Int(readLine()!)!
let st=readLine()!.split(separator:" ")
let s=st[0]
let t=st[1]
let S=Array(s)
let T=Array(t)
var ans:[Character]=[]
for i in 0...n-1{
  ans.append(S[i])
  ans.append(T[i])
}
for a in ans{
  print(a,terminator:"")
}