import java.util.*;

public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		String S = sc.next();
		String[] ss = S.split("", 0);
		String T = sc.next();
		String[] ts = T.split("", 0);
		StringBuilder sb = new StringBuilder();
		for (int n = 0; n < N; n++){
			sb.append(ss[n]);
			sb.append(ts[n]);
		}
		System.out.println(new String(sb));
	}}
/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