Buggy python submission (verdict: Runtime Error):
# -*- coding:utf-8 -*-

cnt = 0
def insection_sort(a, g):
    global cnt
    for i in range(g, len(a)):
        v = a[i]
        j = i - g
        while j >= 0 and a[j] > v:
            a[j+g] = a[j]
            j -= g
            cnt += 1
        a[j+g] = v

def shell_sort(a):
    g = list(1)
    temp = 4
    while temp < len(a):
        g.append(temp)
        temp = 3 * temp + 1

    print(len(g))
    for youso in reversed(g):
        if youso != 1:
            print(youso, end=' ')
        else:
            print(youso)
        insection_sort(a, youso)

inp_num = int(input())
a = list()
for i in range(inp_num):
    a.append(int(input()))
shell_sort(a)
print(cnt)
for i in a:
    print(i)

Fixed submission:
def insertion_sort(A, g):
    cnt = 0
    for i in range(g, len(A)):
        v = A[i]
        j = i - g
        while j >= 0 and A[j] > v:
            A[j+g] = A[j]
            j -= g
            cnt += 1
        A[j+g] = v
    return cnt

def shell_sort(A):
    cnt = 0
    h = 1
    G = []
    while h <= len(A)/2:
        G.append(h)
        h = 3 * h + 1
    if len(G) == 0:
        G.append(1)
    print(len(G))
    print(*G[::-1])
    for g_i in G[::-1]:
        cnt += insertion_sort(A, g_i)
    return cnt

if __name__ == '__main__':
    n = int(input())
    A = []
    for i in range(n):
        A.append(int(input()))

    print(shell_sort(A))
    for a in A:
        print(a)

Buggy python submission (verdict: Runtime Error):
# -*- coding:utf-8 -*-

import math

def insertion_sort(num_list, length, interval):
    cnt = 0
    for i in range(interval, length):
        v = num_list[i]
        j = i - interval
        while j >= 0 and num_list[j] > v:
            num_list[j+interval] = num_list[j]
            j = j - interval
            cnt = cnt + 1
        num_list[j+interval] = v
    return cnt

def shell_sort(num_list, length):
    cnt = 0
    h = 1
    intervals = list()
    while length > h:
        intervals.append(h)
        h = 3 * h + 1
    for i in reversed(range(len(intervals))):
        cnt = cnt + insertion_sort(num_list, length, intervals[i])
    print(len(intervals))
    show_list(intervals)
    print(cnt)

def show_list(list):
    i = len(list) - 1;
    while i > 0:
        print(list[i], end=" ")
        i = i - 1
    print(list[i])

input_num = int(input())
input_list = list()
for i in range(input_num):
    input_list.append(int(input()))
shell_sort(input_list, input_num)
for num in input_list:
    print(num)

Fixed submission:
def insertion_sort(A, g):
    cnt = 0
    for i in range(g, len(A)):
        v = A[i]
        j = i - g
        while j >= 0 and A[j] > v:
            A[j+g] = A[j]
            j -= g
            cnt += 1
        A[j+g] = v
    return cnt

def shell_sort(A):
    cnt = 0
    h = 1
    G = []
    while h <= len(A)/2:
        G.append(h)
        h = 3 * h + 1
    if len(G) == 0:
        G.append(1)
    print(len(G))
    print(*G[::-1])
    for g_i in G[::-1]:
        cnt += insertion_sort(A, g_i)
    return cnt

if __name__ == '__main__':
    n = int(input())
    A = []
    for i in range(n):
        A.append(int(input()))

    print(shell_sort(A))
    for a in A:
        print(a)