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

int main() {
    string s; cin >> s;

    int east = 0;
    int west = 0;

    for (char c : s) {
        if (c == 'O') {
            ++east;
            west = 0;
        } else {
            ++west;
            east = 0;
        }

        if (east == 3) {
            cout << "East" << endl;
            return 0;
        }
        if (west == 3) {
            cout << "West" << endl;
            return 0;
        }
    }
    cout << "NA" << endl;
}