002

#include <iostream>

using namespace std;


int main()
{
	string mas,poli;
	cin >> mas;
	for (int i = 0; i < mas.size()/2; i++)
	{
		if (mas[i] != mas[mas.size() - i-1])
		{
			cout << "NO";
			return 0;
		}
	}
	cout << "YES";

	return 0;
}