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<string.h>

int main()
{
	int i, len;
  	char a[100], b[100], ab[100]={0};
	
  	
  	if(scanf("%d", &len)==EOF) return -1;
  	if(scanf("%s %s", a, b)==EOF) return -1;
 
 	for(i=0;i<len;i++){
    	ab[2*i]=a[i];
    	ab[2*i+1]=b[i];
    }
  
  	printf("%s\n", ab);
  
  	return 0; 
}