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

int main(){
	string s;
	cin >> s;
	
	int cnt=0;
	char ch=s[0];
	for(int i=1;i<s.size();i++){
		if(s[i]==ch) cnt++;
		else{
			cnt=1;
			ch=s[i];
		}
		if(cnt==3){
			cout << (ch=='O'?"East":"West") << endl;
			return 0;
		}
	}
	cout << "NA" << endl;
	return 0;
}