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 JavaScript (node.js v5.12) (judge verdict: Runtime Error)

function main(input) {
    const lines = input.trim().split("\n");
    const N = parseInt(lines[0]);
    const ST = lines[1].split(" ");
    const S = ST[0]
    const T = ST[1]

    let answer = "";
    for (var i = 0; i < N; i++) {
        answer += S[i] + T[i]
    }
    console.log(answer)
}

main(require('fs').readFileSync('/dev/stdin', 'utf8'));