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 (GCC 5.4.1) (judge verdict: Runtime Error)

#include <stdio.h>
#include <stdlib.h>

int main()
{
	char *s;
	char *t;
	int n;
	
	scanf("%d", &n);
	
	s = (char *)malloc(sizeof(char) * n);
	t = (char *)malloc(sizeof(char) * n);
	
	scanf("%s %s", s, t);
	
	for(int i = 0; i < n; i++){
		printf("%c%c", s[i], t[i]);
	}
	printf("\n");
		
	
	free(s);
	free(t);
	
	return 0;
}