import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import static java.lang.System.in;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        String S = reader.readLine();
        int west  = 0;
        int east = 0;
        String result = "NA";
        for (int i = 0; i < S.length(); i++) {
            if(S.charAt(i)=='O') {
                east+=1;
                west=0;
            } else {
                west+=1;
                east=0;
            }

            if(west==3) {
                result="West";
                break;
            } else if ( east == 3) {
                result="East";
                break;
            }
        }
        System.out.println(result);
    }
}