题解 | #字符串排序#

if __name__ == '__main__':
    s = input().strip()
    alpha_list = []
    for i in range(len(s)):
        if s[i].isalpha():
            alpha_list.append(s[i])
    alpha_list.sort(key=lambda x: x.lower())
    ans = list()
    j = 0
    for i in range(len(s)):
        if s[i].isalpha():
            ans.append(alpha_list[j])
            j += 1
        else:
            ans.append(s[i])
    print(''.join(ans))