Problem:
Score : 200 points

Problem Statement

Given are strings s and t of length N each, both consisting of lowercase English letters.

Let us form a new string by alternating the characters of S and the characters of T, as follows: the first character of S, the first character of T, the second character of S, the second character of T, ..., the N-th character of S, the N-th character of T. Print this new string.

Constraints

1 \leq N \leq 100

|S| = |T| = N

S and T are strings consisting of lowercase English letters.

Input

Input is given from Standard Input in the following format:

N
S T

Output

Print the string formed.

Sample Input 1

2
ip cc

Sample Output 1

icpc

Sample Input 2

8
hmhmnknk uuuuuuuu

Sample Output 2

humuhumunukunuku

Sample Input 3

5
aaaaa aaaaa

Sample Output 3

aaaaaaaaaa

Solution in JavaScript (node.js v5.12) (judge verdict: Runtime Error)

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"));