import java.util.*;

 class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        
        long N = sc.nextLong();
        String S = sc.next();
        String T = sc.next();
        
        char[] A = new char[100];
        char[] B = new char[100];
        String ans = new String("");

        for(int i=0;i<N;i++) {
        	ans= ans + S.substring(i,i+1);
        	ans= ans + T.substring(i,i+1);
        }
        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