#include <iostream>
using namespace std;

int main() {
	char a[100];
	bool b = false;
	for (int i = 0; i < 100; i++) {
		cin >> a[i];
		if (a[i] != 'O'&&a[i] != 'X')break;
	}
	for (int i = 0; i < 100; i++) {
		if (a[i] == 'O') {
			if (a[i + 1] == 'O'&&a[i + 2] == 'O') {
				cout << "East" << endl;
				b = true;
				break;
			}
		}
		if (a[i] == 'X') {
			if (a[i + 1] == 'X'&&a[i + 2] == 'X') {
				cout << "West" << endl;
				b = true;
				break;
			}
		}
	}
	if (b == false)cout << "NA" << endl;
	system("pause");
	return 0;
}