import java.util.*;

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();
        
        StringBuilder buf = new StringBuilder();
        
        for (int i = 0; i < n; i++) {
            buf.append(s.substring(i, i + 1));
            buf.append(t.substring(i, i + 1));
        }
        
        String ans = buf.toString();
        
        System.out.println(ans);
        
        
    }
}
        
/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