#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<int(n); i++)
#define FOR(i,m,n) for(int i=int(m); i<int(n); i++)
#define ALL(obj) (obj).begin(),(obj).end()
#define VI vector<int>
#define VLL vector<long long>
#define VVI vector<vector<int>>
#define VVLL vector<vector<long long>>
#define VC vector<char>
#define VS vector<string>
#define VVC vector<vector<char>>
#define fore(i,a) for(auto &i:a)
typedef long long ll;
typedef pair <int, int> P;
template<class T> bool chmax(T &a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> bool chmin(T &a, T b) { if (a > b) { a = b; return true; } return false; }
const int  INF = 2147483647;
const ll INFL = 9223372036854775807;
const ll mod = 1000000007;



int main() {
	string s;
	cin >> s;
	bool b = true;
	int e = 0, w = 0;
	REP(i, s.size()) {
		if (b) {
			if (s[i] == 'O') {
				e++;
				if (e == 3) {
					cout << "East" << endl;
					return 0;
				}
			}
			else {
				e = 0;
				w = 1;
				b = false;
			}
		}
		else {
			if (s[i] == 'X') {
				w++;
				if (w == 3) {
					cout << "West" << endl;
					return 0;
				}
			}
			else {
				w = 0;
				e = 1;
				b = true;
			}
		}
	}
	cout << "NA" << endl;
	return 0;
}