import java.util.*;

class Main {

    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        String A = sc.next();
        String B = sc.next();
        StringBuffer bf = new StringBuffer();
        //ここまで入力

        for(int i=0; i<A.length(); i++){
            bf.append(A.charAt(i));
            bf.append(B.charAt(i));
        }

        System.out.println(bf);
    }
}
/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