#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i = (a); i < (b); ++i)
#define REP(i,n) FOR(i,0,n)
#define SZ(n) (int)(n).size()
#define ALL(n) (n).begin(), (n).end()
using namespace std;
typedef long long LL;
typedef vector<int> VI;

int main() {
	string s;
	cin >> s;
	int w, e;
	e = (int)s.find("OOO");
	w = (int)s.find("XXX");
	if (w == e) {
		cout << "NA" << endl;
		return 0;
	}
	if (w == -1) {
		cout << "East" << endl;
	}
	else if (e == -1){
		cout << "West" << endl;
	}
	else {
		cout << ((w > e) ? "East" : "West") << endl;
	}
	return 0;
}