import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String a = sc.next();

    if (a.length() < 3) {
      System.out.println("NA");
      return;
    }
    char[] ca = a.toCharArray();

    for (int i = 2; i < ca.length; i++) {
      if (ca[i] == ca[i - 1] && ca[i - 1] == ca[i - 2] && ca[i] == ca[i - 2]) {
        if (ca[i] == 'O') {
          System.out.println("East");
          break;
        } else if (ca[i] == 'X') {
          System.out.println("West");
          break;
        } else {
          System.out.println("へんだよ！");
          break;
        }
      } else {
        System.out.println("NA");
        break;
      }
    }

  }
}