#include <stdio.h>
#include <algorithm>
#include <iostream>
#include <string>
#include <vector>
#include <functional>
#include <map>
#include <iomanip>
#include <math.h> 
#include <stack>
#include <queue>
#include <bitset>
#include <cstdlib>
#include <tuple>
#include <cctype>
#include <ctype.h>
#include <set>
#include <sstream>

using namespace std;


int main() {
	int i, j, k;
	string s;

	cin >> s;

	int cnth = 0, cntn = 0;
	int  flag = 0; // 1=higasi 2=nisi

	for (i = 0; i < s.length(); i++) {
		
		if (s[i] == 'O') {
			if (flag == 1) {
				cnth++;
				if (cnth == 3) {
					cout << "East" << endl;
					break;
				}
			}
			else {
				flag = 1;
				cntn = 0;
				cnth = 1;
			}
		}
		else if (s[i] == 'X') {
			if (flag == 2) {
				cntn++;
				if (cntn == 3) {
					cout << "West" << endl;
					break;
				}
			}
			else {
				flag = 2;
				cnth = 0;
				cntn = 1;
			}
		}
	}
	
	if (cnth != 3 && cntn != 3) {
		cout << "NA" << endl;
	}


	getchar();
	getchar();
	return 0;
}