Pangram checker

You are encouraged to solve this task according to the task description, using any language you may know.
A pangram is a sentence that contains all the letters of the English alphabet at least once.

For example:   The quick brown fox jumps over the lazy dog.



Task

Write a function or method to check a sentence to see if it is a   pangram   (or not)   and show its use.



Related tasks

   determine if a string has all the same characters
   determine if a string has all unique characters


declare
  fun {IsPangram Xs}
     {List.sub
      {List.number &a &z 1}
      {Sort {Map Xs Char.toLower} Value.'<'}}
  end
in
  {Show {IsPangram "The quick brown fox jumps over the lazy dog."}}