#include <bits/stdc++.h>

using namespace std;

int main(void) {
  string s;
  cin >> s;

  bool na = true;
  for (int i = 2; i < s.size(); i++) {
    if (s[i] == s[i - 1] && s[i] == s[i - 2]) {
      cout << (s[i] == 'O' ? "East" : "West") << endl;
      na = false;
      break;
    }
  }
  if (na) cout << "NA\n";

  return 0;
}