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

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

  if (s.size() <= 2) {
    cout << "NA" << endl;
    return 0;
  }

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

  return 0;
}