#include <iostream>
#include <algorithm>
#include <string>
using namespace std;

int main(int ac, char **av) {
  string s;
  int n = 0, m = 0;
  cin >> s;
  for (char c : s) {
    if (c == 'O') {
      n++;
      m = 0;
    } else {
      m++;
      n = 0;
    }
    if (abs(n-m) == 3) {
      cout << (((n-m)<0)?"West":"East") << endl;
      return 0;
    }
  }
  cout << "NA" << endl;
  return 0;
}