s=input()
e=0
w=0
if not 'OOO'in s and not 'XXX' in s:
	print('NA')
else:
	for i in range(2,len(s)):
		if 'OOO' in s[:i+1]:
			print('East')
			break
		elif 'XXX' in s[:i+1]:
			print('West')
			break