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[]S1 = S.toCharArray();
      char[]T1 = T.toCharArray();
      
      for(int i =0; i<N; i++){
       System.out.print(S1[i]+""+T1[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