#include <bits/stdc++.h>
#define rep(i, ss, ee) for (int i = ss; i < ee; ++i)
using namespace std;

auto solve() {
  string s, ans = "NA";
  cin >> s;
  size_t e = s.find("OOO");
  size_t w = s.find("XXX");
  if (e < w) ans = "East";
  if (e > w) ans = "West";
  return ans;
}

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << solve() << endl;
  getchar();
}