#include <iostream>		//cin, cout
#include <vector>		//vector
#include <algorithm>	//sort,min,max,count
#include <string>		//string,getline, to_string
#include <cstdlib>		//abs(int)
#include <utility>		//swap, pair
#include <deque>		//deque
#include <climits>		//INT_MAX
#include <bitset>		//bitset
#include <cmath>		//sqrt, ceil. M_PI, pow, sin
#include <ios>			//fixed
#include <iomanip>		//setprecision
#include <sstream>		//stringstream

using namespace std;

int main() {

	string S;
	cin >> S;

	int e = 0, w = 0;
	int ans = -1;
	int flg = -1;

	for (unsigned int i = 0; i < S.length(); i++) {
		if (S[i] == 'O') {
			e++;
			if (flg == 1) {
				if (e == 3) {
					ans = 1;
					break;
				}
			}
			else {
				flg = 1;
				w = 0;
			}
		}
		if (S[i] == 'X') {
			w++;
			if (flg == 0) {
				if (w == 3) {
					ans = 0;
					break;
				}
			}
			else {
				flg = 0;
				e = 0;
			}
		}
	}

	switch (ans) {
	case 1:cout << "East" << endl; break;
	case 0:cout << "West" << endl; break;
	case -1:cout << "NA" << endl; break;
	}

	return 0;

}