#include<iostream>
#include<string>
#include<string.h>
#include<algorithm>
#include<stdio.h>
#include<cmath>
#include<vector>
#include<utility>
#include<stack>
#include<queue>
#include<list>
#include<bitset>

#define FOR(i, a, b) for(int i=(a);i<=(b);i++)
#define RFOR(i, a, b) for(int i=(a);i>=(b);i--)
#define MOD 1000000007
#define INF 1000000000

using namespace std;


int main(void) {
	string s;
	cin >> s;
	if (s.size() < 2) {
		cout << "NA" << endl;
	}
	else {
		FOR(i, 0, s.size() - 2) {
			if (s[i] == 'O'&&s[i + 1] == 'O'&&s[i + 2] == 'O') {
				cout << "East" << endl;
				break;
			}
			else if (s[i] == 'X'&&s[i + 1] == 'X'&&s[i + 2] == 'X') {
				cout << "West" << endl;
				break;
			}
			if (i == s.size() - 2) {
				cout << "NA" << endl;
			}
		}
	}
	
	
	return 0;
}