import java.util.*;
import javax.lang.model.util.ElementScanner6;

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

        // 入力
        int n = sc.nextInt();
        String s = sc.next();
        String t = sc.next();

        StringBuffer tmp = new StringBuffer();
        for (int i = 0; i < n; i++) {
            tmp.append(s.charAt(i));
            tmp.append(t.charAt(i));
        }
        String out = tmp.toString();

        // 出力
        System.out.println(out);
    }
}
/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