#include <iostream>
#include <string>

using namespace std;

int main(int argc, const char * argv[]) {
    string s;
    cin >> s;
    int continuousEast = 0;
    int continuousWest = 0;
    for (size_t i = 0; i < s.size(); ++i) {
        if (s[i] == 'O') {
            ++continuousEast;
            continuousWest = 0;
        } else {
            ++continuousWest;
            continuousEast = 0;
        }
        if (continuousEast == 3) {
            cout << "East" << endl;
            return 0;
        }
        if (continuousWest == 3) {
            cout << "West" << endl;
            return 0;
        }
    }
    cout << "NA" << endl;
    return 0;
}