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

int main(){
	string s;
	int e=0,w=0;
	cin>>s;
	
	if(s.size()<3) {
		cout<<"NA"<<"\n";
		return 0;
	}
	
	for(int i=0;i<s.size()-2;i++){
		if(s[i]=='O'&&s[i+1]=='O'&&s[i+2]=='O') {
			e++;
		}
		else if(s[i]=='X'&&s[i+1]=='X'&&s[i+2]=='X') {
			w++;
		}
	}
	if(e>w) cout<<"East"<<"\n";
	else if(e<w) cout<<"West"<<"\n";
	else cout<<"NA"<<"\n";
	
	return 0;
}