#include <bits/stdc++.h>
using namespace std;

#define FOR(i,l,r) for(int i = (int) (l);i < (int) (r);i++)
#define ALL(x) x.begin(),x.end()
template<typename T> bool chmax(T& a,const T& b){ return a < b ? (a = b,true) : false; }
template<typename T> bool chmin(T& a,const T& b){ return b < a ? (a = b,true) : false; }
typedef long long ll;

int N;
string S;

int main()
{
	cin >> S;
	N = S.size();

	FOR(i,2,N){
		if(S [i] == 'O' && S [i - 1] == 'O' && S [i - 2] == 'O'){
			cout << "East" << endl;
			return 0;
		}
		else if(S [i] == 'X' && S [i - 1] == 'X' && S [i - 2] == 'X'){
			cout << "West" << endl;
			return 0;
		}
	}

	cout << "NA" << endl;

	return 0;
}