#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

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

	string s;
	cin >> s;

	int e = s.find("OOO");
	int w = s.find("XXX");
	//cerr << "e : " << e << ", w : " << w << endl;

	if(e == string::npos) e = 1e9;
	if(w == string::npos) w = 1e9;

	if(e == 1e9 && w == 1e9) cout << "NA" << endl;
	else if(e < w) cout << "East" << endl;
	else cout << "West" << endl;
}