#include <iostream>
#include <string>

int main() {
	std::string str, yuki = "yukicoder";
	std::cin >> str;

	int w = 0, e = 0;
	for (int i = 0; i < str.size(); i++) {
		if (str[i] == 'O') {
			e++;
			w = 0;

			if (e == 3) {
				std::cout << "East\n";
				return 0;
			}
		}
		else if (str[i] == 'X') {
			w++;
			e = 0;

			if (w == 3) {
				std::cout << "West\n";
				return 0;
			}
		}
	}

	std::cout << "NA\n";

	return 0;
}