import java.util.Scanner;

public class Main
{
    public static void main(String[] args)
    {   
        Scanner in = new Scanner(System.in);
        
        String strSrc, strDst;
        StringBuffer sb;
        while(in.hasNextLine())
        {
            strSrc = in.nextLine();
            sb = new StringBuffer(strSrc);
            sb.reverse();
            strDst = sb.toString();
            
            if (strSrc.equals(strDst))
                System.out.println("Yes!");
            else
                System.out.println("No!");
        }
    }    
}
/**************************************************************
	Problem: 2186
	User: admin
	Language: Java
	Result: Accepted
	Time:629 ms
	Memory:40076 kb
****************************************************************/