Pseudocódigo/Diagramas de Flujo - Ayuda con Pseudocodigo

def shell_sort (alist) :

    gap = len(alist)//2

    while gap>0:

        for index in range(gap,len(list1)) :

            current_element = alist [index]

            pos = index

            while pos>=gap and current_element<alist[pos-gap] :

                alist[pos] = alist[pos-gap]

                pos = pos-gap

            alist[pos] = current_element

        gap = gap//2

num = int(input("list lenght"))

list1 = [int(input()) for i in range(num)]

shell_sort(list1)

print ("sorted list",list1)