#include <bits/stdc++.h>

using namespace std;

int main(void)
{
	cin.tie(0);
	ios::sync_with_stdio(false);

	string s;

	cin >> s;

	int n = s.length();

	for (int i = 0; i <= n - 3; i++)
	{
		string t = s.substr(i, 3);
		if (t == "OOO")
		{
			cout << "East" << '\n';
			return 0;
		}
		else if (t == "XXX")
		{
			cout << "West" << '\n';
			return 0;
		}
	}
	cout << "NA" << '\n';
	return 0;
}