demo_Either_Monad = do
  print (isPasswordValid "0aaaaa")
  print (isPasswordValid "aaaaaa")
  print (isPasswordValid "0aaaa")
demo_Either_Monad = do
  print (isPasswordValid "0aaaaa")
  print (isPasswordValid "aaaaaa")
  print (isPasswordValid "0aaaa")
demo_Either_Monad = do
  print (isPasswordValid "0aaaaa")
  print (isPasswordValid "aaaaaa")
  print (isPasswordValid "0aaaa")