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

int main() {
  string S;
  cin >> S;
  int w = 0, e = 0;
  for (int i = 0; i < S.size(); i++) {
    if (S.at(i) == 'X') w++;
    else e++;
    if (w == 3) {
      cout << "West" << "\n";
      return 0;
    }
    if (e == 3) {
      cout << "East" << "\n";
      return 0;
    }
  }
  cout << "NA" << "\n";
}