str = input()words = []str = str.upper()for word in str: if 'A' <= word <= 'Z' and word not in words: words.append(word)words = sorted(words)print(','.join(words))

s = 'i miss you'# s=input()s = s.replace(' ', '').upper()s = list(set(list(s)))length= len(s)# 第一级遍历for index in range(length): # 第二级遍历 for j in range(1, length - index): if ord(s[j - 1]) > ord(s[j]): # 交换两者数据，这里没用temp是因为python 特性元组。 s[j - 1], s[j] = s[j], s[j - 1]for i in s: print(i,end=',')

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补充一下：