public class Main{
  public static void main(String[] args){
    String line = new java.util.Scanner(System.in).next();
    if(line.indexOf("XXX") == -1 && line.indexOf("OOO") != -1)System.out.println("East");
    else if(line.indexOf("XXX") != -1 && line.indexOf("OOO") == -1)System.out.println("West");
    else if(line.indexOf("XXX") < line.indexOf("OOO"))System.out.println("West");
    else if(line.indexOf("XXX") > line.indexOf("OOO"))System.out.println("East");
    else System.out.println("NA");
  }
}