import java.util.*;

import java.util.Stack;

class stackReverse {

static Stack<Character> s=new Stack<>();

static void reverse()

{

if(s.isEmpty())

{

return;

}

char a=s.pop();

reverse();

insertBottom(a);

}

static void insertBottom(char a)

{

if(s.isEmpty())

{

s.push(a);

return;

}

char b=s.pop();

insertBottom(a);

s.push(b);

}

public static void main(String[] args) {

Scanner in = new Scanner(System.in);

// String ans = "",

String data = in.nextLine();

for (char element : data.toCharArray())

{

s.push(element);

}

reverse();

// for (char element : data.toCharArray()) {

// ans += s.pop();

// }

System.out.print(s);

}

}