#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <iomanip>
#include <cmath>
#include <stdio.h>
#include <queue>
#include <deque>
#include <cstdio>
#include <set>
#include <map>
#include <bitset>
#include <stack>
#include <cctype>
using namespace std;
int main() {
	string s;
	cin >> s;
	int e = 0, w = 0;
	for (int i = 0; i < s.size(); i++) {
		if (w == 3) {
			cout << "West" << endl;
			return 0;
		}
		if (e == 3) {
			cout << "East" << endl;
			return 0;
		}
		if (s[i] == 'O') {
			w = 0;
			e++;
		}
		else {
			e = 0;
			w++;
		}
	}
	if (w == 3) {
		cout << "West" << endl;
		return 0;
	}
	if (e == 3) {
		cout << "East" << endl;
		return 0;
	}
	cout << "NA" << endl;
}