input: Write a python function to check if two strings are anagrams.
  assert isAnagram("listen", "silent") == True
  assert isAnagram("hello", "bello") == False
  assert isAnagram("evil", "vile") == True
  assert isAnagram("fluster", "restful") == True
output: def isAnagram(str1, str2):
      return sorted(str1) == sorted(str2)