S = input()
flag = 0
for i in range(len(S)-2):
	if S[i]==S[i+1]==S[i+2]=='O':
		flag = 1
		break
	elif S[i]==S[i+1] == S[i+2] == 'X':
		flag = 2
		break
if flag == 0:
	print('NA')
elif flag == 1:
	print('East')
else:
	print('West')