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();
        String Sspt[] = S.split("");
        String Tspt[] = T.split("");
        
        for(int i=0;i<N;i++){
            System.out.print(Sspt[i]);
            System.out.print(Tspt[i]);
            
        }
        
        
    }
}

/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