题解 | #字符串排序#

while True:
    try:
        strings = input()
        chars = ''

        for i in strings:
            if i.isalpha():
                chars += i
        #key=lambda x: x.upper()或者x.lower()可以满足排序要求
        chars_sorted = ''.join(sorted(chars, key=lambda x: x.upper()))
        # print(chars)
        # print(chars_sorted)
        index = 0
        result = ''
        for j in range(len(strings)):
            if strings[j].isalpha():
                #注意此处要用index不能用j
                result += chars_sorted[index]
                index += 1
            else:
                result += strings[j]
        print(result)
    except:
        break