package com.company;


import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        int count = console.nextInt();
        int myArray[]= new int [count];

        for (int i =0; i < myArray.length ; i++) {
            int number=console.nextInt();
            myArray[i]=number;
        }

        for (int i = 0 ; i < myArray.length ; i++) {
            System.out.print(myArray[i]);
        }

        for (int i = myArray.length - 1; i>= 0  ; i--) {
            System.out.print(myArray[i]);
        }

    }
}