#include <bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) begin(v),end(v)
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }
using ll = long long;
using pii = pair<int, int>;
constexpr ll INF = 1ll<<30;
constexpr ll longINF = 1ll<<60;
constexpr ll MOD = 1000000007;
constexpr bool debug = false;
//---------------------------------//

int main() {
	string S;
	cin >> S;
	int ans = 2;
	FOR(i, 2, S.size()) {
		string sub = S.substr(i - 2, 3);
		if (sub == "OOO") { ans = 0; break; }
		else if (sub == "XXX") { ans = 1; break; }
	}
	
	if (ans == 0) puts("East");
	else if (ans == 1) puts("West");
	else puts("NA");
}