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: Wrong Answer)

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

int main(void) {
	char s[105], t[105], output[210];
	int i, n, s_num=0, t_num=0;
	
	scanf("%d", &n);
	scanf("%s", s);
	scanf("%d", t);

	for (i = 0; i < 2*n; i++) {
		if (i % 2 == 0) {
			output[i] = s[s_num];
			s_num++;

		}
		else {
			output[i] = t[t_num];
			t_num++;
		}
		printf("%d, %d, %d\n", i, s_num, t_num);
	}
	
	output[2 * n] = '\0';

	printf("%c", output[1]);

	return 0;
}