// Program 13: Extend a String to a Palindrome

import java.util.*;
class AppendPalindrome {
    static boolean palindrome(String s, int start) {
        int left = start;
        int right = s.length() - 1;
        while (left < right) {
            if (s.charAt(left) != s.charAt(right)) {
                return false;
            }
            left++;
            right--;
        }
        return true;
    }
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        int start = 0;
        while (!palindrome(s, start)) {
            start++;
        }
        String result = s;
        for (int i = start - 1; i >= 0; i--) {
            result += s.charAt(i);
        }
        System.out.println(result);
    }
}