import java.util.Scanner;

public class No_486 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.nextLine();
		int O = 0;
		int X = 0;
		for (int i = 1; i <= s.length(); i++) {
			String s2 = s.substring(i - 1, i);
			if (s2.equals("O")) {
				O++;
				X = 0;
			} else if (s2.equals("X")) {
				X++;
				O = 0;
			}
			if(O >= 3 || X >= 3){
				break;
			}
		}
		if (O == 3) {
			System.out.println("East");
		} else if (X == 3) {
			System.out.println("West");
		} else {
			System.out.println("NA");
		}
	}
}