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

signed main(){
	string str;
	cin >> str;
	string w = "XXX";
	string e = "OOO";
	
	for(int i = 0; i < str.length() - 2; i++){
		if(str.length() < 3) break;
		string s = str.substr(i, 3);
		if(s == w){
			cout << "West" << endl;
			return 0;
		}else if(s == e){
			cout << "East" << endl;
			return 0;
		}
	}
	
	cout << "NA" << endl;
}