//Normal

#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

void print(auto a){
  cout << a;
}

void prints(auto a){
  cout << a << " ";
}

void prints(){
  cout << " ";
}

void printl(auto a){
  cout << a << endl;
}

void printl(){
  cout << endl;
}

void fix(int n){
  cout << fixed << setprecision(n);
}

int main(){
  string S; cin >> S;
  int siz = (int)S.size();
  
  int W = (int)S.find("XXX");
  int E = (int)S.find("OOO");
  
  if(W == -1) W = 1e9;
  if(E == -1) E = 1e9;
  
  W < E ? printl("West") : W > E ? printl("East") : printl("NA");
  
  return 0;
}