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: Accepted)

function Main (input) {
  input = input.split("\n");
  var N = parseInt(input[0], 10);
  var o1 = input[1].split(" ");
  var S = o1[0];
  var T = o1[1];

  var i = 0;
  var ans = "";
  while (N > i) {
    var o2 = String(S.slice(i, i+1)) + String(T.slice(i, i+1));
    ans = ans + o2;
    i++
  }
  console.log(ans);
}

Main(require("fs").readFileSync("/dev/stdin", "utf8"));