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: Accepted)

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);
		 
		int N = scan.nextInt();
		String A = scan.next();
		String B = scan.next();
 
		char[] ac = A.toCharArray();
		char[] bc = B.toCharArray();
 
		//ArrayList<String> list = new ArrayList<String>();
		StringBuilder sb = new StringBuilder();
		
 
		for(int i = 0; i< N; i++) {
			sb.append(ac[i]);
			sb.append(bc[i]);
		}
		
		System.out.println(sb.toString());
	}
}