AC

#include <bits/stdc++.h>
using namespace std;

int main()
{
    string str, ans = "";
    cin >> str;
    for(int i = str.size() - 1; i >= 0; i--)
        ans += str[i];
    if(ans == str) cout << "Yes" << endl;
    else cout << "No" << endl;
    return 0;
}