package main

import (
	"fmt"
	"strings"
)

func main() {
	var s string
	fmt.Scan(&s)
	a := strings.Index(s, "OOO")
	b := strings.Index(s, "XXX")
	if a != -1 && b != -1 {
		if a < b {
			fmt.Println("East")
		} else {
			fmt.Println("West")
		}
	} else if a != -1 {
		fmt.Println("East")
	} else if b != -1 {
		fmt.Println("West")
	} else {
		fmt.Println("NA")
	}
}