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 <math.h>
     
    int main(){
              
      int n;
      char s[128];
      char t[128];
      int i;
      char st[256];
      
      scanf("%d",&n);
      
      for(i=0; i<n; i++){
      	scanf("%s %s",s,t);
      }
      
      for(i=0; i<(n*2); i++){
      	st[i*2] = s[i];
        st[(2*i)+1] = t[i];
      }
   
      printf("%s",st);
      return 0;
     
    }