#include<iostream>
#include<algorithm>
#include <vector>
#include<cmath>
using namespace std;
typedef long long int lont;
int main() {
	string S;
	cin >> S;
	int Z = S.size();
	if (Z < 3) {
		cout << "NA" << endl;
	}
	else {
		int IA = 100000;
		int IB = 100000;
		for (int ia = 0; ia < Z-2; ia++) {
			if (S.at(ia) == 'O' &&
				S.at(ia + 1) == 'O' &&
				S.at(ia + 2) == 'O') {
				IA = ia;
			}
		}
		for (int ib = 0; ib < Z - 2; ib++) {
			if (S.at(ib) == 'X' &&
				S.at(ib + 1) == 'X' &&
				S.at(ib + 2) == 'X') {
				IB = ib;
			}
		}
		if (IA == 100000 && IB == 100000) {
			cout << "NA" << endl;
		}
		else if (IA > IB) {
			cout << "West" << endl;
		}
		else if (IA < IB) {
			cout << "East" << endl;
		}
	}
}