#include <iostream>
using namespace std;

int main(){
  string s;
  cin >>s;
  int cnt=1;
  for(int i=0;i<=s.size();i++){
    if(s[i]==s[i+1]){
      cnt++;
      if(cnt==3){
	if(s[i]=='O'){cout << "East" << endl;return 0;}
	else{ cout << "West" << endl; return 0;}
      }
    }else cnt=1;
  }
  cout << "NA" << endl;
  return 0;
}