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>
#include <string.h>
int main(void){
	int length,i=0;
	scanf("%d",&length);
	char s[length+1],t[length+1],done[2*length+1];
	scanf("%s%s",s,t);
	while(i<=2*length-1){
		if(i%2==0){
			done[i]=s[i/2];
		}else{
			done[i]=t[(i-1)/2];
		}
		i++;
	}
	done[2*length]='\0';
	printf("%s",done);
	return 0;
}