#include <iostream>
#include <vector>


using namespace std;

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