#include <iostream>
#include <string.h>
#include <stdio.h>
#include <algorithm>
using namespace std;
int main()
{ 
 	int hws,b,sum=0;
 	cin>>hws;
 	for(int a=hws;a>0;a/=10)
 	{
 		b=a%10;//一次是个，2次十位，等等
		sum=sum*10+b; 
	 }
	 if(sum==hws)
	 {
	 	cout<<"yes";
	 
	 }
	 	else
	 	cout<<"no";
		return 0;
}
yujie好厉害