以下代码显示“单词”在字符串中出现一次的位置。如何更改代码，以便如果“单词”在字符串中出现多次，它将打印所有位置？
string = input("Please input a sentence: ")
word = input("Please input a word: ")
string.lower()
word.lower()
list1 = string.split(' ')
position = list1.index(word)
location = (position+1)
print("You're word, {0}, is in position {1}".format (word, location))
sentence = input("Please input a sentence: ")
word = input("Please input a word: ")
sentence = sentence.lower()
word = word.lower()
wordlist = sentence.split(' ')
print ("Your word '%s' is in these positions:" % word)
for position,w in enumerate(wordlist):
if w == word:
print("%d" % position + 1)
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