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 Java8 (OpenJDK 1.8.0) (judge verdict: Runtime Error)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.*;

public class Main{
  
  public static void main(String[] args){
	  
	  BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
	  
	  try {
		  int stringLength = Integer.parseInt(bufferedReader.readLine());
		  String s = bufferedReader.readLine();
		  String t = bufferedReader.readLine();
		  List<String> sList = Arrays.asList(s.split(""));
		  List<String> tList = Arrays.asList(t.split(""));
		  List<String> anString = new ArrayList<>();
		  for (int i = 0; i < stringLength; i++) {
			anString.add(sList.get(i));
			anString.add(tList.get(i));
		}
		  String ans = String.join("", anString);
		  System.out.println(ans);
		  

	} catch (IOException e) {
		System.out.println(e.getCause());
	}

  }
}