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 Rust (1.42.0) (judge verdict: Accepted)

use std::io::{self, Write};

fn main() {
    let len: usize = read_line_as_value();
    // println!("{}", len);

    let mut input_iter = read_line_as_vector::<String>().into_iter();
    let s_str = input_iter.next().unwrap();
    let t_str = input_iter.next().unwrap();
    // println!("{} {}", s_str, t_str);

    let s_chars: Vec<char> = s_str.as_str().chars().collect();
    let t_chars: Vec<char> = t_str.as_str().chars().collect();

    for i in 0..len {
        print!("{}{}", s_chars[i], t_chars[i]);
    }
    print!("\n");
    io::stdout().flush().unwrap();
}

fn read_line_as_value<T: std::str::FromStr>() -> T {
    let mut input = String::new();
    let res = std::io::stdin().read_line(&mut input);
    if let Err(error) = res {
        panic!("io error at stdin.read_line: {}", error);
    };
    match input.trim().parse() {
        Ok(val) => val,
        _ => panic!("error while parsing input: {}", input)
    }
}

fn read_line_as_vector<T: std::str::FromStr>() -> Vec<T> {
    let mut input = String::new();
    let res = std::io::stdin().read_line(&mut input);
    if let Err(error) = res {
        panic!("io error at stdin.read_line: {}", error);
    };
    match input.trim().split_whitespace().map(|x| x.parse()).collect::<Result<Vec<T>, _>>() {
        Ok(vec) => vec,
        _ => panic!("error while parsing input: {}", input)
    }
}