Problem: Pari has a friend who loves palindrome numbers. A palindrome number is a number that reads the same forward or backward. For example 12321, 100001 and 1 are palindrome numbers, while 112 and 1021 are not.

Pari is trying to love them too, but only very special and gifted people can understand the beauty behind palindrome numbers. Pari loves integers with even length (i.e. the numbers with even number of digits), so she tries to see a lot of big palindrome numbers with even length (like a 2-digit 11 or 6-digit 122221), so maybe she could see something in them.

Now Pari asks you to write a program that gets a huge integer n from the input and tells what is the n-th even-length positive palindrome number?

Input

The only line of the input contains a single integer n (1 ≤ n ≤ 10100 000).

Output

Print the n-th even-length palindrome number.

Examples

Input

1


Output

11


Input

10


Output

1001

Note

The first 10 even-length palindrome numbers are 11, 22, 33, ... , 88, 99 and 1001.

Solution (in JAVA):

Solution:
//package ProblemSet;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.StringTokenizer;

public class B688 {
	private static void solve() throws IOException{
		Reader r = new Reader();
		PrintWriter w = new PrintWriter(System.out);
		StringBuilder sb = new StringBuilder();
		r.init(System.in);
		String s = r.next();
		sb.append(s);
		sb.reverse();
		w.println(s+sb);
		w.flush();
	}
	
	public static void main(String[] args) throws IOException{
		solve();
	}
}

class Reader {
	static BufferedReader reader;
	static StringTokenizer tokenizer;
	static BigInteger big;
	static void init(InputStream input) {
		reader = new BufferedReader(new InputStreamReader(input));
		tokenizer = new StringTokenizer("");
	}
	static String next() throws IOException {
		while ( ! tokenizer.hasMoreTokens() ) {
			tokenizer = new StringTokenizer(reader.readLine());
		}
		return tokenizer.nextToken();
	}
	static int ni() throws IOException {
		return Integer.parseInt( next() );
	}
	static double nd() throws IOException {
		return Double.parseDouble( next() );
	}
	static long nl() throws IOException {
		return Long.parseLong( next() );
	}
	static BigInteger nb() throws IOException{
		return big = new BigInteger( next() );
	}
	static int[] nia(int n) throws IOException{
		int[] a = new int[n];
		for(int i=0; i<n; i++) a[i]=ni();
		return a;
	}
	static long[] nla(long n) throws IOException{
		long[] a = new long[(int)n];
		for(int i=0; i<n; i++) a[i]=nl();
		return a;
	}
	static double[] nda(int n) throws IOException{
		double[] a = new double[n];
		for(int i=0; i<n; i++) a[i]=nd();
		return a;
	}
	static char[] nca() throws IOException{
		char[] a = next().toCharArray();
		return a;
	}
	static BigInteger[] nba(int n) throws IOException{
		BigInteger[] a = new BigInteger[n];
		for(int i=0; i<n; i++) a[i]=nb();
		return a;
	}
	static int[][] ni2(int m, int n) throws IOException{
		int[][] a = new int[m][n];
		for(int i=0; i<m; i++){
			for(int j=0; j<n; j++){
				a[i][j]=ni();
			}
		}
		return a;
	}
	static long[][] nl2(long m, long n) throws IOException{
		long[][] a = new long[(int)m][(int)n];
		for(int i=0; i<m; i++){
			for(int j=0; j<n; j++){
				a[i][j]=nl();
			}
		}
		return a;
	}
	static double[][] nd2(int m, int n) throws IOException{
		double[][] a = new double[m][n];
		for(int i=0; i<m; i++){
			for(int j=0; j<n; j++){
				a[i][j]=nd();
			}
		}
		return a;
	}
	static BigInteger[][] nb2(int m, int n) throws IOException{
		BigInteger[][] a = new BigInteger[m][n];
		for(int i=0; i<m; i++){
			for(int j=0; j<n; j++){
				a[i][j]=nb();
			}
		}
		return a;
	}
}