import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        // 長さＮ
        int n = sc.nextInt();

        // 文字列Ｓ、Ｔ
        String s = sc.next();
        String t = sc.next();

        StringBuilder result = new StringBuilder();
        for (int index = 0; index < n; index++) {
            result.append(s.charAt(index));
            result.append(t.charAt(index));
        }

        // 出力
        System.out.println(result);
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz