#include <bits/stdc++.h>
using namespace std;
int main(){
  string S;
  cin >> S;
  int N = S.size();
  string ans = "NA";
  for (int i = 0; i <= N - 3; i++){
    if (S.substr(i, 3) == "OOO"){
      ans = "East";
      break;
    }
    if (S.substr(i, 3) == "XXX"){
      ans = "West";
      break;
    }
  }
  cout << ans << endl;
}