import java.lang.*;

import java.io.*;

import java.util.*;

class StringRev{

public static void main(String args[]){

String str=new Scanner(System.in).nextLine();

/*System.out.println("hi"+" "+str);

StringBuilder input=new StringBuilder();

input.append(str);

input=input.reverse();

System.out.println("hi"+" "+input);*/

/*byte[] arr = str.getBytes();

System.out.println(Arrays.toString(arr));*/

/*byte[] arr = str.getBytes();

byte[] result = new byte[arr.length];

for(int i=0;i<arr.length;i++){

result[i]=arr[arr.length-i-1];

}

System.out.println(new String(result));*/

/*char arr[] = str.toCharArray();

for(int i=arr.length-1;i>=0;i--){

System.out.print(arr[i]);

}*/

char arr[]=str.toCharArray();

List<Character> trial1 =new ArrayList<>();

for(char c:arr)

trial1.add(c);

Collections.reverse(trial1);

ListIterator li = trial1.listIterator();

while (li.hasNext())

System.out.print(li.next());

}

}