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 C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using static System.Console;

class Program
{
	static void Main(string[] args)
	{
		int N = int.Parse(ReadLine());
		string[] ST = new string[N];
		ST = ReadLine().Split(' ');
		string S = ST[0];
		string T = ST[1];
		string result = "";
		for(int i = 0;i < N;i++)
		{
			result = string.Concat(result, S[i]);
			result = string.Concat(result, T[i]);
		}
		WriteLine(result);
	}
}