#include<iostream>

int main(int argc, char const *argv[]) {
  std::string record;
  std::cin >> record;
  if(record.size() >= 1 && record.size() <= 1000){
    if(record.size() >= 3){
      int tmp;
      for (int i = 0; i < record.size() - 2; ++i){
        tmp = (int)((int)record[i] + (int)record[i + 1] + (int)record[i + 2]);
        if(tmp == 3 * (int)'O'){
          std::cout << "East\n";
          return 0;
        }
        else if(tmp == 3 * (int)'X'){
          std::cout << "West\n";
          return 0;
        }
      }
    }
  }
  std::cout << "NA\n";
  return 0;
}