package main

import "fmt"

func main() {
	var S string

	fmt.Scan(&S)

	for i := 0; i < len(S)-2; i++ {
		if S[i] == S[i+1] && S[i+1] == S[i+2] {
			if S[i] == 'O' {
				fmt.Println("East")
			} else {
				fmt.Println("West")
			}
			return
		}
	}
	fmt.Println("NA")
}