#include<bits/stdc++.h>

using namespace std;


int main()
{
  string S;
  cin >> S;

  int a = S.find("OOO"), b = S.find("XXX");
  if(a == string::npos) a = 114514;
  if(b == string::npos) b = 114514;

  if(a < b) cout << "East" << endl;
  else if(a > b) cout << "West" << endl;
  else cout << "NA" << endl;
}