How to solve this challenge?

def combiner(argList):
    result = ""
    #finding sum of all the numbers and appending all the string
    Nsum=0.0
    Ssum=""
    for i in argList:
        #if i is int or float add into sum of numbers otherwise it must be a string.
        #isinstance(a, classname) function checks if <a> is an object of class <classname>
        #Remember, the number could be an int or a float.
        if isinstance(i, int) or isinstance(i, float):
            Nsum = Nsum + i
        else:
            Ssum += i
    #Appending string_collection and sum_of_numbers together into a string.
    result = Ssum + str(Nsum)
    return result