#include<iostream>
#include<algorithm>

using namespace std;

bool check(string s) {
	int n = s.size();
	for(int i = 0; i < n / 2; i ++ ) {
		if (s[i] != s[n - i - 1])
			return false;
	}
	return true;
}

int main() {
	
	string s;
	while (cin >> s) {
		if (check(s)) {
			puts("Yes!");
		} else {
			puts("No!");
		}
	}
	return 0;
}