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

	int main() {
		string s;
		cin>>s;
		for(int i=0;i<(int)s.length()-2;i++){
			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;
}