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


: pangram? ( addr len -- ? )
  0 -rot bounds do
    i c@ 32 or [char] a -
    dup 0 26 within if
      1 swap lshift or
    else drop then
  loop
  1 26 lshift 1- = ;
 
s" The five boxing wizards jump quickly." pangram? .   \ -1