#include <bits/stdc++.h>

using namespace std;

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

    if (s.size() < 3) {
        cout << "NA" << endl;
        return 0;
    }

    string win = "NA";
    for (int i = 0; i + 2 < s.size(); ++i) {
        if (s[i] == s[i + 1] && s[i] == s[i + 2]) {
            win = (s[i] == 'O') ? "East" : "West";
            break;
        }
    }

    cout << win << endl;
    return 0;
}