#include <iostream>
#include <algorithm>
#include <string>
#include <stack>
#include <queue>
#include <vector>
#include <map>
#include <cstdio>
#include <cmath>
using namespace std;

int main() {
	string s;
	cin >> s;
	int cnto = 0, cntx = 0;
	for (int i = 0; i < s.size(); i++) {
		if (s[i] == 'O') {
			cnto++;
			cntx = 0;
		}
		else {
			cntx++;
			cnto = 0;
		}
		if (cnto == 3) {
			cout << "East" << endl;
			return 0;
		}
		if (cntx == 3) {
			cout << "West" << endl;
			return 0;
		}
	}
	cout << "NA" << endl;
	return 0;
}