#include<iostream>
#include<cmath>
#include<algorithm>
#include<string>
#include<map>
using namespace std;
int main() {
	string s;
	while (cin >> s) {
		int index = 1;
		for (int i = 0;i <= s.length() / 2;i++) {
			if (s[i] != s[s.length() - i - 1]) {
				cout << "No!" << endl;
				index = 0;
				break;
			}
		}
		if (index == 1) {
			cout << "Yes!" << endl;
		}
	}
	return 0;
}