#include <iostream>
#include <fstream>
#include <string>
#include <vector>

int main(void) {

	//std::ifstream inf("Text.txt");	std::cin.rdbuf(inf.rdbuf());
	
	unsigned int e = 0, w = 0;
	std::string S;
	std::cin >> S;

	for (unsigned int i = 0; i < S.length(); i++) {
		if (S[i] == 'O') {
			e++;
			w = 0;
			if (e == 3) {
				std::cout << "East" << std::endl;
				return 0;
			}
		}
		else {
			w++;
			e = 0;
			if (w == 3) {
				std::cout << "West" << std::endl;
				return 0;
			}
		}
	}

	std::cout << "NA" << std::endl;

	return 0;
}