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


import rdstdin
 
proc isPangram(sentence: string, alphabet = {'a'..'z'}): bool =
  var sentset: set[char] = {}
  for c in sentence: sentset.incl c
  alphabet <= sentset
 
echo isPangram(readLineFromStdin "Sentence: ")