#include <iostream>

using namespace std;

int main()
{
    string a;
    cin >> a;
    for (int i = 0; i < a.size(); i++)
        if (a[i] < 'a')
           a[i] = (char)(((int)a[i]) + 32);
        
    bool flag = true;
    for (int i = 0; i<a.size(); i++) {
        if (a[i] != a[a.size() - 1 - i]) {
            flag = false;
            break;
        }
    }
    if (flag)
        cout << "YES";
    else
        cout << "NO";
    return 0;
}