#include <iostream>
#include <iomanip>
typedef unsigned long long ul;
typedef signed long long ll;

int main(void)
{
  std::cin.tie(0);
  std::ios::sync_with_stdio(false);
  std::cout << std::fixed << std::setprecision(15);
  std::string s;
  std::cin >> s;
  for (int i = 2; i < s.size(); ++i) {
    if (s[i-2] == s[i-1] && s[i-1] == s[i]) {
      std::cout << (s[i]=='O' ? "East" : "West") << std::endl;
      return 0;
    }
  }
  std::cout << "NA" << std::endl;
  return 0;
}