#include <bits/stdc++.h>
using namespace std;

int main(void) {
    string s;
    cin >> s;
    char tmp='*';
    int cnt = 0;
    for (int i=0; i<s.size(); i++) {
        if (tmp == s[i]) cnt++;
        else cnt = 0;
        tmp = s[i];
        if (cnt == 2) {
            if (s[i] == 'O') cout << "East";
            else cout << "West";
            cout << endl;
            return 0;
        }
    }
    cout << "NA" << endl;
    return 0;
}