#include <bits/stdc++.h>

using namespace std;

int main() {
	string s;
	cin >> s;
	if (s.length() >= 3) {
		for (int i = 0; i < s.length() - 2; i++) {
		    if (s.substr(i, 3) == "OOO") {
			    cout << "East" << endl;
			    return 0;
		    } else if (s.substr(i, 3) == "XXX") {
			    cout << "West" << endl;
		        return 0;
		    }
	        cout << "NA" << endl;
	    }
	} else {
		cout << "NA" << endl;
	}
	return 0;
}