#include <iostream>
#include <string>
using namespace std;

int main() {
    string s;
    cin >> s;
    int cnt = 0;
    char prev = -1;
    for(int i=0; i<s.size(); ++i) {
        if(prev == -1 || prev == s[i]) {
            cnt++;
            if(cnt == 3) {
                if(s[i] == 'O') {
                    cout << "East" << endl;
                } else {
                    cout << "West" << endl;
                }
                return 0;
            }
        } else {
            cnt = 1;
        }
        prev = s[i];
    }
    cout << "NA" << endl;
}