#include <bits/stdc++.h>

using namespace std;

int main() {
  string s;
  cin >> s;
  int n = s.size();
  int cnt = 0;
  bool w = true;
  for (int i = 0; i < n; ++i) {
    if (s[i] == 'O' && !w) {
      w = true;
      cnt = 0;
    } else if (s[i] == 'X' && w) {
      w = false;
      cnt = 0;
    }
    cnt++;
    if (cnt == 3) {
      cout << (w? "East": "West") << '\n';
      return 0;
    }
  }
  cout << "NA" << '\n';
  return 0;
}