import java.util.Scanner;
class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    char[] S = sc.next().toCharArray();
    char[] T = sc.next().toCharArray();
    StringBuilder sb = new StringBuilder();
    for(int i=0; i<N; i++){
      sb.append(S[i]);
      sb.append(T[i]);
    }
    System.out.print(sb.toString());
  }
}
      

/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