package bao;

 import java.util.Scanner;

 public class Work {

     public static boolean digui(String str1,int i,int j) {

         if(j==1||j==0) {

             return true;

         }

         else {

             if(str1.charAt(i)==str1.charAt(j)) {

                 return digui(str1,++i,--j);

             }

             else {

                 return false;

             }

         }

     }//end digui

     public static void main(String[] args) {

         Scanner sca=new Scanner(System.in);

         boolean bool;

         String str;

         str=sca.next();

         int i=0;

         int j=str.length()-1;

         bool=digui(str,i,j);

         if(bool==true) {

             System.out.println(str+" 是回文!");

         }

         else {

             System.out.println(str+" 不是回文");

         }

     }//end main

 }//end Work