#include <iostream>
#include <algorithm>
#include <cstring>
#include <string>
#include <vector>
#include <queue>
#include <deque>
#include <cmath>

#define AS(a) (sizeof(a)/sizeof(a[0]))
using namespace std;
long long int MOD = 1000000007;
long long int INF = 1000000007;


int main() {

  string a;
  cin >> a;
  for(int i = 0; i < (int)a.length()-2; i++) {
    if(a[i] == 'O' && a[i+1] == 'O' && a[i+2] == 'O') {
      cout << "Eest" << endl;
      return 0;
    } else if(a[i] == 'X' && a[i+1] == 'X' && a[i+2] == 'X') {
      cout << "West" << endl;
      return 0;
    }
  }
  cout << "NA" << endl;


}