input: Write a python function to check if elements in a list are palindromes.
  assert check_palindromes([12, 121, 3])==['12 is not a palindrome', '121 is a palindrome', '3 is a palindrome']
  assert check_palindromes([111, 234, 545, 678])==['111 is a palindrome', '234 is not a palindrome', '545 is a palindrome', '678 is not a palindrome']
  assert check_palindromes([1, 22, 333, 4444])==['1 is a palindrome', '22 is a palindrome', '333 is a palindrome', '4444 is a palindrome']
output: def check_palindromes(lst):
      result = []
      for num in lst:
          num_str = str(num)
          if num_str == num_str[::-1]:
              result.append(f'{num} is a palindrome')
          else:
              result.append(f'{num} is not a palindrome')
      return result