#include <iostream>
#include <string>
using namespace std;
int main(){
	char s[101];
	cin >> s;

	for(int i=0; i<98; i++){
		if(s[i]==s[i+1] && s[i+1]==s[i+2]){
			if(s[i]=='O') cout << "East" << endl;
			if(s[i]=='X') cout << "West" << endl;
			return 0;
		}
	}

	cout << "NA" << endl;
	return 0;
}