import java.io.*;
import java.util.*;

public class Main {

    public static void main(final String[] args) throws Exception {
        final Scanner sc = new Scanner(System.in);
        long N;
        N = sc.nextLong();
        String S;
        S = sc.next();
        String T;
        T = sc.next();

        final Solver solver = new Solver();
        solver.solve(N, S, T);
    }
}

class Solver {
    public void solve(long N, String S, String T) {
        for (int i = 0; i < N; i++) {
            System.out.print(S.charAt(i));
            System.out.print(T.charAt(i));
        }
        System.out.println();
    }
}


/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