#include <iostream>
#include <cstdio>
#include <algorithm>
#include <string>
#include <vector>
#include <set>
#include <map>

using namespace std;

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