S = raw_input()
east, west = 0, 0
for c in S:
	if c == 'O':
		east, west = east+1, 0
		if east >= 3:
			print "East"
			exit(0)
	else:
		east, west = 0, west+1
		if west >= 3:
			print "West"
			exit(0)
print "NA"