import java.util.*;
import java.io.*;

public class Main {
	
	public static void main(String[] args) throws IOException {
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		int n = Integer.parseInt(in.readLine());
		StringTokenizer st = new StringTokenizer(in.readLine());
		String s = st.nextToken(), t = st.nextToken();
		String r = "";
		for(int i = 0; i < n; i++) {
			r += s.charAt(i);
			r += t.charAt(i);
		}
		System.out.println(r);
	}
	
}




/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