import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        try (Scanner in = new Scanner(System.in)) {
            int N = in.nextInt();
            String S = in.next();
            String T = in.next();

            StringBuilder res = new StringBuilder();
            for (int i = 0; i < N; i++) {
                res.append(S.charAt(i));
                res.append(T.charAt(i));
            }

            System.out.println(res.toString());
        }
    }
}
/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