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()
{
    int n;
    scanf("%d",&n);
    char s1[n+1],s2[n+1],s3[2*n+1];
    scanf("%s%s",s1,s2);
    int k=0;
    for(int i=0;i<n;i++){
        s3[k]=s1[i];
        k++;
        s3[k]=s2[i];
        k++;
    }
    for(int i=0;i<k;i++){
        printf("%c",s3[i]);
    }
    return 0;
}