#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
#define pb push_back
#define mp make_pair
#define rep(i,n) for(int i=0;i<(n);++i)

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
	string s;cin >> s;
	int cnt=0;
	char c=s.at(0);
	rep(i,s.size()){
		if(s.at(i)==c) cnt++;
		else{
			c=s.at(i);
			cnt=1;
		}
		if(cnt==3){
			if(c=='O') cout << "East" << endl;
			else cout << "West" << endl;
			return 0;
		}
	}
	cout << "NA" << endl;
}