#include <bits/stdc++.h>
using namespace std;

int main() {
  string s;
  cin >> s;
  for (int i = 0; i < (int)s.size() - 2; i++) {
    if (s[i] == 'O' && s[i + 1] == 'O' && s[i + 2] == 'O') {
      cout << "East" << endl;
      return 0;
    } else if (s[i] == 'X' && s[i + 1] == 'X' && s[i + 2] == 'X') {
      cout << "West" << endl;
      return 0;
    }
  }
  cout << "NA" << endl;
  return 0;
}