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 System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _20191224_ATC
{
    class Program
    {
        static void Main(string[] args)
        {
            var m = int.Parse(Console.ReadLine());
            var str = Console.ReadLine().ToString().Split(' ');
            var s = str[0];
            var t = str[1];

            //Zip : 2つのリストから一個ずつ取り出して結合する
            //SelectMany : 結合したものを1文字ずつ1つのリストにまとめる
            var output = s.Zip(t, (x, y) => new[] { x, y }).SelectMany(xs => xs);
            //foreach (var item in output)
            //{
            //    Console.WriteLine(item);
            //}

            //char型のリストから文字列を生成
            Console.WriteLine(string.Join("", output));
        }

        private static void ABC148_A()
        {
            var a = int.Parse(Console.ReadLine());
            var b = int.Parse(Console.ReadLine());
            var c = Enumerable.Range(1, 3).Where(x => x != a && x != b).First();
            Console.WriteLine(c);
        }
    }
}