#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
  #define _GLIBCXX_DEBUG
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  string s;
  cin >> s;
  rep(i, (int) s.size() - 2) {
    if (s.substr(i, 3) == "OOO") {
      cout << "East" << endl;
      return 0;
    }
    if (s.substr(i, 3) == "XXX") {
      cout << "West" << endl;
      return 0;
    }
  }
  cout << "NA" << endl;
  return 0;
}