#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <stdio.h>
#include <cstring>
#include <queue>
#include <stack>
#include <functional>
#include <math.h>
using namespace std;
#define Would
#define you

int w, e;
int main() {
	string h, ans;
	cin >> h;
	for (int i = 0; i < h.length(); ++i) {
		if (h[i] == 'O') {
			++w;
			e = 0;
		}
		else {
			++e;
			w = 0;
		}
		if (w == 3) {
			cout << "West" << endl;
			return 0;
		}
		else if (e == 3) {
			cout << "East" << endl;
			return 0;
		}
	}
	cout << "NA" << endl;
}