import java.util.*;
public class MidLetter {
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
String str=sc.nextLine();
int len=str.length();
if(len%2==0)
{
StringBuilder sb=new StringBuilder(str);
sb.reverse();
System.out.println(sb.toString());
}
else if(len%2!=0)
{
System.out.println("Length of string is " +len);
int mid=len/2;
mid++;
System.out.println("Substring of string is "+mid);
String substr=str.substring(0,mid-1);
String remainSub=str.substring(mid-1,len);
StringBuilder sb=new StringBuilder(substr);
sb.reverse();