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

int main() {
  string S; cin >> S;
  int E = 0, W = 0;
  for(int i = 0; i < (int)S.size(); i++){
    if(S[i] == 'O'){
      E++;
      if(E == 3){
        cout << "East" << endl;
        return 0;
      }
      W = 0;
    }else{
      W++;
      if(W == 3){
        cout << "West" << endl;
        return 0;
      }
      E = 0;
    }
  }
  cout << "NA" << endl;
}