#include<bits/stdc++.h>
using namespace std;
int main(){
	string str;	
	while(cin >> str){
		string str2 = str;
		reverse(str.begin(), str.end());
		if(str == str2)
			cout << "Yes!" << endl;
		else
			cout << "No!" << endl;
	}	
	return 0;
}