#include <iostream>
#include <string>
using namespace std;

int main() {
  string s;
  bool east = false, west = false;
  int cnt_east = 0, cnt_west = 0;
  cin >> s;
  for (auto& e : s) {
    if (e == 'O') {
      cnt_west = 0;
      cnt_east++;
      if (cnt_east == 3) {
        east = true;
        break;
      }
    } else {
      cnt_east = 0;
      cnt_west++;
      if (cnt_west == 3) {
        west = true;
        break;
      }
    }
  }
  if (east) cout << "East" << endl;
  else if (west) cout << "West" << endl;
  else cout << "NA" << endl;
}