#include<iostream>
using namespace std;

int main() {
    string s;
    while (cin >> s) {
        int len = s.size();
        bool flag = false;
        for (int i = 0; i < len / 2; i++) {
            if (s[i] != s[len - i - 1]) {
                flag = true;
                cout << "No!" << endl;
                break;
            }
        }
        if (flag) {
            continue;
        }
        cout << "Yes!" << endl;

    }
    return 0;
}