import java.util.*;

public class test {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String str = sc.next();
        String[] sp = str.split("");
        boolean b = false;
        
        for(int i=0; i<sp.length-2; i++){
        	if(sp[i].equals("O") && sp[i+1].equals("O") && sp[i+2].equals("O")  ){
        		System.out.println("East");
        		b = true;
        		break;
        	}
        	else if(sp[i].equals("X") && sp[i+1].equals("X") && sp[i+2].equals("X")  ){
        		System.out.println("West");
        		b = true;
        		break;
        	}
        }
        if(b == false){
        	System.out.println("NA");
        }
    }
}