class Solution:

    """

    @param str_ing: a string containing uppercase alphabets and integer digits

    @return: the alphabets in the order followed by the sum of digits

    """

    def rearrange(self, str_ing):

        # Write your code here

        list_str = list(str_ing)

        number = []

        letter = []

        if str_ing == '':

            return ''

        for i in list_str:

            if i >= '' and i <= '':

                number.append(int(i))

            elif i >= 'A' and i <= 'Z':

                letter.append(i)

        # sum_str = str(sum(number))

        sum_str = str(sum(number))

        letter.sort()

        letter.append(sum_str)

        str_letter = "".join(letter)

        return str_letter