#include <iostream>
using namespace std;
int main() {
    string s;
    cin >> s;
    int i = 0;
    int j = s.size() - 1;

    while(i < j) {
        if(s[i] == s[j]) {
            i++;
            j--;
        }
        else {
            cout << "NE E PALINDROM" << endl;
            return 0;
        }
    }
    cout << "PALINDROM" << endl;
    return 0;
}