#include <iostream>
#include <string>
using namespace std;
 
int main() {
	string s;cin>>s;
	if(s.size()<3)goto heaven;
	for(int i=0;i<s.size()-1;i++){
		if(s[i]==s[i+1]&&s[i+1]==s[i+2]){
			if(s[i]=='O')cout<<"East\n";
			else cout<<"West\n";
		return 0;
		}
	}heaven:
	cout<<"NA\n";
}