#include <iostream> #include <string> using namespace std; int main() { string num; cin >> num; string reverse_num = num; for (size_t i = 0; i < num.size(); i++) { reverse_num[i] = num[num.size() - 1 - i]; } if (num == reverse_num) { cout << "YES" << endl; } else { cout << "NO" << endl; } return 0; }