#include <iostream>
using namespace std;

int main(){
	string s;
	cin >> s;
	for(int i = 0, e = 0, w = 0; i < s.size(); i++){
		if(s[i] == 'O'){
			e++;
			w = 0;
		}else{
			w++;
			e = 0;
		}
		if(e >= 3 || w >= 3){
			cout << (e >= 3 ? "East" : "West") << endl;
			return 0;
		}
	}
	cout << "NA" << endl;
}