package main

import . "fmt"
import . "strings"

func main() {
	var s string
	Scan(&s)
	e:=Index(s,"OOO")
	w:=Index(s,"XXX")
	if e==w {
		Println("NA")
	} else if e<0||(w>=0&&w<e) {
		Println("West")
	} else {
		Println("East")
	}
}