#include   
using namespace std;  
  
void isHuiwen(int number)  
{   
  int n = 0;//余數(shù).  
  int m = number; 
  while(m != 0)  
  {  
    n = n*10 + m %10; //number的最低位變?yōu)閚的最高位 
    m = m /10;  
  }  
 
  if(n==number)  
    cout << "yes" << endl;  
  else  
    cout << "no" << endl;  
}  
  
int main()  
{  
  int number;  
  while(cin >> number)  
    isHuiwen(number);  
  return 0;  
}