#include <iostream>

using namespace std;

int main(){
	char str[101];
	cin >> str;
	int ite = 0;
	int east = 0;
	int west = 0;
	while (1) {
		if (str[ite] == '\0') break;
		char c = str[ite];
		if (c=='O') {
			east++;
			west = 0;
		}
		else {
			west++;
			east = 0;
		}
		if (east==3) {
			cout << "East" << endl;
			return 0;
		}
		if (west==3) {
			cout << "West" << endl;
			return 0;
		}
		ite++;

	}
	cout << "NA" << endl;
	return 0;
}