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: Accepted)

#include<stdio.h>

int main(void) {

	int i;
	int n;
	char tmp;
	char s[101];
	char t[101];
	char res[202];

	scanf("%d", &n);
	scanf("%s %s", s, t);

	//printf("%s\n", s);
	//printf("%s\n", t);

	for (i = 0; i < n; i++) {
		res[2 * i] = s[i];
		res[2 * i + 1] = t[i];
	}

	for (i = 0; i < 2 * n; i++) {
		printf("%c", res[i]);
	}


	return 0;
}