import java.util.Scanner;

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

			char[] schar = S.toCharArray();
			char[] tchar = T.toCharArray();
			char[] rchar = new char[N*2];
			
			for(int i=0;i<N;i++) {
				rchar[2*i]= schar[i];
				rchar[2*i+1]=tchar[i];
			}
			
			
			System.out.println(rchar);
	}	

}
/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