/*No.486 3 Straight Win(3連勝)*/
import java.io.*;
public class No486 {
	public static void main(String[] args) {
		try(BufferedReader input =new BufferedReader(new InputStreamReader(System.in))){
			String result=input.readLine();
			int eastPoint=Search(result,"East"),westPoint=Search(result,"West");			
			if(eastPoint==-1||westPoint==-1){
				Judge(eastPoint,westPoint,true);
			}else{
				Judge(eastPoint,westPoint,false);
			}
		}catch(Exception e){
			e.printStackTrace();
		}
	}
	static int Search (String result,String team){
		int score=0;
		if(team.equals("East")){
			score=result.indexOf("OOO");
		}else if(team.equals("West")){
			score=result.indexOf("XXX");
		}
		return score;
	}
	static void Judge(int East,int West,boolean flg){
		if(flg==true){
			if(East>West){
				System.out.println("East");
			}else if(East<West){
				System.out.println("West");
			}else{
				System.out.println("NA");
			}
		}else{
			if(East<West){
				System.out.println("East");
			}else{
				System.out.println("West");
			}
		}
	}
}