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)

///           _____                  _______                  _____                   _____
///          /\    \                /::\    \                /\    \                 /\    \
///         /::\    \              /::::\    \              /::\____\               /::\    \
///        /::::\    \            /::::::\    \            /:::/    /              /::::\    \
///       /::::::\    \          /::::::::\    \          /:::/    /              /::::::\    \
///      /:::/\:::\    \        /:::/~~\:::\    \        /:::/    /              /:::/\:::\    \
///     /:::/__\:::\    \      /:::/    \:::\    \      /:::/    /              /:::/__\:::\    \
///    /::::\   \:::\    \    /:::/    / \:::\    \    /:::/    /              /::::\   \:::\    \
///   /::::::\   \:::\    \  /:::/____/   \:::\____\  /:::/    /      _____   /::::::\   \:::\    \
///  /:::/\:::\   \:::\    \|:::|    |     |:::|    |/:::/____/      /\    \ /:::/\:::\   \:::\    \
/// /:::/  \:::\   \:::\____|:::|____|     |:::|____|:::|    /      /::\____/:::/  \:::\   \:::\____\
/// \::/    \:::\  /:::/    /\:::\   _\___/:::/    /|:::|____\     /:::/    \::/    \:::\  /:::/    /
///  \/____/ \:::\/:::/    /  \:::\ |::| /:::/    /  \:::\    \   /:::/    / \/____/ \:::\/:::/    /
///           \::::::/    /    \:::\|::|/:::/    /    \:::\    \ /:::/    /           \::::::/    /
///            \::::/    /      \::::::::::/    /      \:::\    /:::/    /             \::::/    /
///            /:::/    /        \::::::::/    /        \:::\__/:::/    /              /:::/    /
///           /:::/    /          \::::::/    /          \::::::::/    /              /:::/    /
///          /:::/    /            \::::/____/            \::::::/    /              /:::/    /
///         /:::/    /              |::|    |              \::::/    /              /:::/    /
///         \::/    /               |::|____|               \::/____/               \::/    /
///          \/____/                 ~~                      ~~                      \/____/
//I am aqua
#include<bits/stdc++.h>
typedef long long ll;
typedef long double ld;
#define mp make_pair
#define speed  ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define fo for(int i=0;i<n;i++) cin>>a[i];
#define pb push_back
#define pob pop_back
#define pf push_front
#define pof pop_front
#define l first
#define r second
#define input.txt ifstream fin("input.txt"); ofstream fout("output.txt");
using namespace std;
///--------------------------------------------------------------------------------------------------------------------

///--------------------------------------------------------------------------------------------------------------------

///--------------------------------------------------------------------------------------------------------------------
int main()
{
    int n;
    string s,t;
    cin>>n>>s>>t;
    for(int i=0;i<n;i++)
    {
        cout<<s[i]<<t[i];
    }
}
///I know that ;
///I know where I am
///Do not think I don't