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

string s;

int main() {
	cin >> s;
	
	for (int i = 0; i < (int)s.length() - 2; i++) {
		if (s[i] == s[i + 1] && s[i + 1] == s[i + 2]) {
			if (s[i] == 'O') cout << "East" << endl;
			else cout << "West" << endl;
			return 0;
		}
	}
	cout << "NA" << endl;
	return 0;
}