#include <bits/stdc++.h>
using namespace std;
 
int main(){
  string S; cin>>S;
  int size=S.size();
  bool frag1=false,frag2=false;
  for(int i=0;i<size-2;i++){
      if(S[i]==S[i+1] && S[i+1]==S[i+2] && S[i]=='o'){
          frag1=true;
          break;
      }
      else if(S[i]==S[i+1] && S[i+1]==S[i+2] && S[i]=='x'){
          frag2=true;
          break;
      }
  }
  if(frag1){
      cout<<"East"<<endl;
  }
  else if(frag2){
      cout<<"West"<<endl;
  }
  else{
      cout<<"NA"<<endl;
  }
}