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

int main()
{
	string s; cin >> s;
	int a = 0, b = 0;
	for (int i = 0; i < s.size(); i++) {
		if (s[i] == 'O')a++,b=0;
		else b++,a=0;
		if (a == 3) {
			cout << "East" << endl;
			return 0;
		}
		else if (b == 3) {
			cout << "West" << endl;
			return 0;
		}
	}
	cout << "NA" << endl;
    return 0;
}