import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
		String [] s = sc.next().split("");
		sc.close();
		int countE = 0;
		int countW = 0;
		String result = "";
		for ( int i = 0; i < s.length; i++ ){
			if ( s[i].equals("O")){
				countE++;
				countW = 0;
			} else if ( s[i].equals("X")){
				countW++;
				countE = 0;
			}
			if( countE == 3 ) {
				result = "East";
				break;
			} else if( countW == 3){
				result = "West";
				break;
			} else {System.out.println("NA");}

		}
		System.out.println(result);
    }
}