S = input().strip()

O = 0
X = 0

for i in S:
  if i == 'O':
    O += 1
    X = 0
  else:
    X += 1
    O = 0
  
  if O == 3:
    print('East')
    break
  elif X == 3:
    print('West')
    break
else:
  print('NA')