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：