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++14 (GCC 5.4.1) (judge verdict: Accepted)

#include <iostream>
#include <algorithm>
#include <climits>
#include <numeric>
#include <iomanip>
#include <cmath>
#include <vector>
#include <set>
#include <unordered_set>
#include <string>
#include <queue>
#include <deque>
#include <stack>
#include <map>
#include <unordered_map>
 
#define barsik ios::sync_with_stdio(false)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
 
typedef long long ll;
typedef std::vector<int> vi;
typedef std::pair <int, int> pii;
typedef std::unordered_set <int> u_si;
 
using namespace std;
void solve(){
    int n;
    cin >> n;
    string s, t;
    cin >> s >> t;
    for(int i = 0; i < n; i++){
        cout << s[i] << t[i];
    }
}

 
int main(){
    barsik;
    int q = 1;
//    freopen("file.txt", "w", stdout);
    //cin >> q;
 
    for(double i = 1; i <= q; i++){
        //cout << "Case " << i << ": ";
        solve();
    }
}