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 Go (1.6) (judge verdict: Accepted)

package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	inputArray, _ := toIntArray(splitInput(scanner, " "))
	n := inputArray[0]
	st := splitInput(scanner, " ")
	s := st[0]
	t := st[1]

	for i := 0; i < n; i++ {
		fmt.Printf("%s", s[i:i+1])
		fmt.Printf("%s", t[i:i+1])
	}
	fmt.Println()
}

func splitInput(scanner *bufio.Scanner, sep string) []string {
	scanner.Scan()
	return strings.Split(scanner.Text(), sep)
}

func toIntArray(str []string) ([]int, error) {
	length := len(str)
	resVal := make([]int, length)
	var err error
	for i := 0; i < length; i++ {
		resVal[i], err = strconv.Atoi(str[i])
		if err != nil {
			return nil, err
		}
	}
	return resVal, nil
}