#include <iostream>
#include <string>

int main() {
  const std::string w("West");
  const std::string e("East");
  std::string in;

  std::cin >> in;

  if (in.length() < 3) {
    std::cout << "NA" << std::endl;
    return 0;
  }
  for (auto itr = in.begin() + 2; itr != in.end(); itr++) {
    if (*(itr-2) == *(itr-1) && *(itr-1) == *itr) {
      if (*itr == 'X') std::cout << w << std::endl;
      else std::cout << e << std::endl;
      return 0;
    }
  }
  std::cout << "NA" << std::endl;
  return 0;
}