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