#include <bits/stdc++.h>
using namespace std;
const string ans[3] = {"NA", "West", "East"};

int main() {
    string s;
    cin >> s;
    
    int k = 0;
    for (int i = 0; i < s.length(); i++) {
        if (s.substr(i, 3) == "XXX") { k = 1; break; }
        if (s.substr(i, 3) == "OOO") { k = 2; break; }
    }
    
    cout << ans[k] << endl;
    return 0;
}