#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
using namespace std;

int max(int a, int b) {
	int x = (a > b) ? a : b;
	return x;
}

int min(int a, int b) {
	int x = (a < b) ? a : b;
	return x;
}

int main() {
	string s;
	cin >> s;
	int e = 0, w = 0;
	bool judge = true;
	for (int i = 0; i < s.length(); i++) {
		if (s[i] == 'O') {
			e++;
			w = 0;
		}
		else if (s[i] == 'X') {
			w++;
			e = 0;
		}
		if (e == 3) {
			cout << "East" << endl;
			judge = false;
			break;
		}
		if (w == 3) {
			cout << "West" << endl;
			judge = false;
			break;
		}
	}

	if (judge)cout << "NA" << endl;
	
	return 0;
}