#include<iostream>
#include<string>
using namespace std;
int main() {
	string s;
	cin >> s;
	int win = 0, lose = 0;
	for (int i = 0;i<s.size();i++) {
		if (s[i] == 'O') {
			win++;
			lose = 0;
		}
		else {
			lose++;
			win = 0;
		}
		if (win == 3 || lose == 3) {
			cout << (win == 3 ? "East" : "West") << endl;
			return 0;
		}
	}
	cout << "NA" << endl;
}