#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.substr(i, 3) == "OOO") {
      cout << "East" << endl;
      return 0;
    }
    if (S.substr(i, 3) == "XXX") {
      cout << "West" << endl;
      return 0;
    }
  }
  cout << "NA" << endl;
  return 0;
}