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 <string.h>
#include <stdio.h>

int main(void)
{
	char a[256],b[256],c[512];
	int i,j,N;
	scanf("%d",N);
	scanf("%s","%s",a,b);

	for(i=0;;++i)
	{
	j=c[2*i]=a[i];
	c[2*i+1]=b[i];
	if(j == '\0')
	break;
	}
	printf("%s\n%s\n%s\n",a,b,c);
	return 0;
	}