#include <bits/stdc++.h>
using namespace std;

int main() {
  string S;
  cin >> S;
  int e = (int)S.find("OOO"), w = (int)S.find("XXX");
  cout << ((e == -1 && w == -1) ? "NA" : (e < w && e != -1) ? "East" : "West") << "\n";
}