#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vll = vector<long long>;
template <typename T> T get() {
    T r;
    cin >> r;
    return r;
}
template <typename T> vector<T> get_v(ll n) {
    vector<T> v;
    for (int i = 0; i != n; i++) {
        v.push_back(get<T>());
    };
    return v;
}
template <typename T> void show_v(vector<T> v) {
    for (ll i = 0; i != v.size() - 1; i++)
        cout << v[i] << " ";
    cout << *(v.end() - 1) << endl;
}

int main() {
    string s = get<string>();
    ll o = 0, x = 0;
    for (ll i = 0; i != s.size(); i++) {
        if (s[i] == 'O') {
            o++;
            x = 0;
        } else {
            x++;
            o = 0;
        }
        if (o == 3) {
            cout << "East" << endl;
            break;
        }

        if (x == 3) {
            cout << "West" << endl;
            break;
        }
    }
    if (o != 3 && x != 3) {
        cout << "NA" << endl;
    }

    system("pause");
}