package main

import "fmt"

func main() {
	var s string
	fmt.Scan(&s)
	for i := 0; i+2 < len(s); i++ {
		t := s[i : i+3]
		if t == "OOO" {
			fmt.Println("East")
			return
		} else if t == "XXX" {
			fmt.Println("West")
			return
		}
	}
	fmt.Println("NA")
}