def check_palindrome(my_string):
   if(my_string == my_string[::-1]):
      return True
   else:
      return False

def print_sort_palindromes(my_sentence):
   my_list = []

   my_result = list(my_sentence.split())

   for i in my_result:

      if(check_palindrome(i)):
         my_list.append(i)

   my_list.sort()

   j = 0

   for i in range(len(my_result)):

      if(check_palindrome(my_result[i])):
         my_result[i] = my_list[j]
         j = j + 1

   for i in my_result:
      print(i)

my_sentence = "hi madam, how are u"
print("The sentence is ")
print(my_sentence)
print("The result is :")
print_sort_palindromes(my_sentence)

句子是
hi madam, how are u
结果是：
hi
madam,
how
are
u