#include<bits/stdc++.h>
using namespace std;
int main()
{
	int a;
	cin>>a;
	if(a%100==a/100%100) cout<<"YES";
	else cout<<"NO";
	return 0;
}

#include<bits/stdc++.h> using namespace std; int main() { int a; cin>>a; if(a%100==a/100%100) { cout<<"YES"; } else { cout<<"NO"; } return 0; }