s = "hello world how are you"
words = s.lower().split() # 将所有单词转换为小写
word_count = {}
for word in words:
if word in word_count:
word_count[word] += 1
else:
word_count[word] = 1
sorted_words = sorted(word_count.keys())
for word in sorted_words:
print(f"{word}: {word_count[word]}")
