#include <iostream>
#include <algorithm>
#include <cstdio>
#include <string>

#define ll long long

using namespace std;

int B[11];

int main(){
  
  string s;
  cin>>s;
  int w=0,e=0;
  for(int i=0;i<s.length();++i){
      if(s[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;
  return 0;
}