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

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