text = input()
x = text.find('XXX')
o = text.find('OOO')
if x > -1 and o > -1:
  if x < o:
    print("West")
  else:
    print("East")
elif x > -1 or o > -1:
  if x > -1:
    print("West")
  else:
    print("East")
elif x == -1 and o == -1:
  print("NA")