#include <bits/stdc++.h>
using namespace std;

int main() {
    string s;
    cin >> s;
    int east = 0, west = 0;
    for (int i = 0; i < s.size(); i++) {
        if (s.at(i) == 'O') {
            east++;
            west = 0;
            if (east == 3) {
                cout << "East" << endl;
                return 0;
            }
        } else {
            west++;
            east = 0;
            if (west == 3) {
                cout << "West" << endl;
                return 0;
            }
        }
    }
    cout << "NA" << endl;
}