#include <iostream>
#include <string>

using namespace std;

int main() {
	string s;
	cin >> s;

	int posO = s.find("OOO");
	int posX = s.find("XXX");

	if (posO == string::npos) {
		posO = s.size();
	}
	if (posX == string::npos) {
		posX = s.size();
	}

	string win;
	if (posO < posX) {
		win = "East";
	} else if (posO > posX) {
		win = "West";
	} else {
		win = "NA";
	}
	cout << win << endl;
	return 0;
}