# import sys; input = sys.stdin.buffer.readline
# sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	S = input()
	east = 0
	west = 0
	for i in S:
		if i == "O":
			east += 1
			west = 0
			if east == 3:
				print("East")
				return
		else:
			west += 1
			east = 0
			if west == 3:
				print("West")
				return

	print("NA")


if __name__ == '__main__':
	main()