change letter to lowercast with haskell issue -

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I have this question: "Write the Haskell function blackmindrom :: [four] -> Identify the hair as madness, like" Madam, I \ 'm Adam "notice, you need to throw all the capital letters in lower case and throw punctuation before comparing it."

I write this code in Hackel:

  import char less :: string -> String less xs = [tolow ch | Ch & lt; -xs] tolow :: char - & gt; Four Toulouse's | IsUpper ch = chr (ord ch + 32). Otherwise = CE and Andromont :: [Four] - & gt;  
 Main> ImageDial "DSD"  
 
  
 
 P> 
 Main> iPialidrome "DSD" 
 
 The truth is 
 
 Why is it not that I lie with capital letters?