#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;


int main() {
  std::cin.tie(0);
  std::ios::sync_with_stdio(false);

  string S;
  cin >> S;

  int east = 0;
  int west = 0;

  for(int i=0;i<S.size();i++){
    if(S.at(i) == 'O'){
      west = 0;
      east++;
    }else{
      east = 0;
      west++;
    }
    if(west >= 3 || east >= 3) break;
  }
  if(east >= 3){
    cout << "East" << endl;
  }else if(west >= 3){
    cout << "West" << endl;
  }else{
    cout << "NA" << endl;
  }

  return 0;
}