def sum_string(s1, s2):

    n1 = get_number(s1)
    n2 = get_number(s2)
    return str(n2 + n1)
>>> sum_string('10', '5')
dataset/ETHPy150Open bt3gl/Python-and-Algorithms-and-Data-Structures/src/builtin_structures/sum_two_numbers_as_strings.py/sum_string