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