#include <iostream>
#include <string>
using namespace std;

int main(void) {
	size_t east, west;
	string s;
	cin >> s;
	east = s.find("OOO", 0);
	west = s.find("XXX", 0);
	if (east < west) {
		cout << "East" << endl;
	}
	else if (east > west) {
		cout << "West" << endl;
	}
	else{
		cout << "NA" << endl;
	}
	return 0;
}