#include <iostream>
#include <cmath>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;
typedef long long lint;

#define MIN(a,b) ((a)<(b)?(a):(b))
#define MAX(a,b) ((a)>(b)?(a):(b))



int main()
{
	char fst, sec, thd;
	string S;
	cin >> S;
	if (S.size() < 3) {
		cout << "NA" << endl;
		return 0;
	}
	sec = S[0]; fst = S[1];
	for (int i = 2; i < S.size(); i++) {
		thd = sec; sec = fst; fst = S[i];
		if (thd == sec && sec == fst) {
			cout << (fst == 'O' ? "East" : "West") << endl;
			return 0;
		}
	}
	cout << "NA" << endl;
	return 0;
}