Untitled

#include <iostream>
#include <string>
using namespace std;

int main()
{
    string s, a , b;
    int c = 0;
    cin >> s;

    int n = s.length();
    
    for (int i = 1; (i - 1) < n; i++)
    {
        if (s[i - 1] == s[s.length() - i])
        {
            c++;
        }
        else
        {
            cout << "NO";
            return 0;
        }
        
    }
    if (c == n)
    {
        cout << "YES";
    }

}