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