#include <bits/stdc++.h>
#define rep(i,n)for(long long i=0;i<(n);i++)
using namespace std;
typedef unsigned long long ull;
typedef long long ll;
const ll INF=1e18;
const int MOD=1e9+7;
const double pi=acos(-1);

int main(){
  string s;
  cin >> s;
  string ans="NA";
  if(s.size()>=3){
    rep(i,s.size()-2){
      if(s[i]==s[i+1] && s[i+1]==s[i+2]){
        if(s[i]=='O'){
          ans="East";
          break;
        }
        else{
          ans="West";
          break;
        }
      }
    }
  }
  cout << ans << endl;
}