#include<iostream>
using namespace std;

int main()
{
	int a, c, d, flag;
	cin >> a;
    d = 10000;
    flag = 0;
    c = a;
	while (a > 0) {
		if ((a % 10) == ((c / d) % 10)) flag = 1;
		else { flag = 0; break; }
	a = a / 10;
	d = d / 10;
	}
	if (flag == 1) cout << "YES" << endl;
	else cout << "NO" << endl;
	return 0;
}