#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
  string S;
  cin>>S;
  int N = S.size();
  if(N < 3){
    cout<<"NA"<<endl;
    return 0;
  }
  for(int i=2;i<N;i++){
    if(S[i] == S[i-1] && S[i-2] == S[i]){
      if(S[i] == 'O'){
        cout<<"East"<<endl;
        return 0;
      }
      else{
        cout<<"West"<<endl;
        return 0;
      }
    }
  }
  cout<<"NA"<<endl;
}