import java.util.*;
class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n  = Integer.parseInt(sc.next());
        char[] s = sc.next().toCharArray();
        char[] t = sc.next().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