#include <bits/stdc++.h>

using namespace std;

int main() {
    string s;
    cin >> s;
    if (s.size() == 1 || s.size() == 2) {
        cout << "WA" << endl;
        return 0;
    }
    for (int i = 0; i < s.size() - 2; i++) {
        if (s.substr(i, 3) == "OOO") {
            cout << "East" << endl;
            return 0;
        }
        if (s.substr(i, 3) == "XXX") {
            cout << "West" << endl;
            return 0;
        }
    }
    cout << "NA" << endl;
    return 0;
}