Buggy python submission (verdict: Runtime Error):
def multiple_factors(i, N):
  factors = []
  factors.append(int(1*i))
  for index in range(1, N//i):
    factors.append(int(index*i))
  return factors
  
def assign_ball(factors, blist, ai, b_add_index):
  sum_b = 0
  for index in range(len(factors)-1, 0, -1):
    sum_b += blist[factors[index]-1]
  
  if ai != sum_b%2:
    blist[factors[0]-1] =1
    b_add_index.append(str(factors[index]))
  return blist, b_add_index

      
N = int(input())
alist = list(map(int, input().split()))
blist = [0 for i in range(N)]
M = 0
b_add_index = []
for i in range(N-1,-1, -1):
  factors = multiple_factors(i+1, N)
  blist, b_add_index = assign_ball(factors, blist, alist[i], b_add_index)

if sum(blist)%2 != alist[0]:
  print(-1)
else:
  print(len(b_add_index))
  print(" ".join(b_add_index))

Fixed submission:
def multiple_factors(i, N):
  factors = []
  for index in range(0, N//i):
    factors.append(int((index+1)*i))
  return factors
  
def assign_ball(factors, blist, ai, b_add_index):
  sum_b = 0
  for index in range(len(factors)-1, 0, -1):
    sum_b += blist[factors[index]-1]
  
  if ai != sum_b%2:
    blist[factors[0]-1] = 1
    b_add_index.append(str(factors[0]))
  return blist, b_add_index

      
N = int(input())
alist = list(map(int, input().split()))
blist = [0 for i in range(N)]
b_add_index = []
for i in range(N-1,-1, -1):
  factors = multiple_factors(i+1, N)
  blist, b_add_index = assign_ball(factors, blist, alist[i], b_add_index)

if sum(blist)%2 != alist[0]:
  print(-1)
else:
  print(len(b_add_index))
  print(" ".join(b_add_index))

Buggy python submission (verdict: Runtime Error):
def multiple_factors(i, N):
  factors = []
  factors.append(int(1*i))
  for index in range(1, N//i):
    factors.append(int(index*i))
  return factors
  
def assign_ball(factors, blist, ai, b_add_index):
  sum_b = 0
  for index in range(len(factors)-1, 0, -1):
    sum_b += blist[factors[index]-1]
  
  if ai != sum_b%2:
    blist[factors[-1]-1] =1
    b_add_index.append(str(factors[index]))
  return blist, b_add_index

      
N = int(input())
alist = list(map(int, input().split()))
blist = [0 for i in range(N)]
M = 0
b_add_index = []
for i in range(N-1,-1, -1):
  factors = multiple_factors(i+1, N)
  blist, b_add_index = assign_ball(factors, blist, alist[i], b_add_index)

if sum(blist)%2 != alist[0]:
  print(-1)
else:
  print(len(b_add_index))
  print(" ".join(b_add_index))

Fixed submission:
def multiple_factors(i, N):
  factors = []
  for index in range(0, N//i):
    factors.append(int((index+1)*i))
  return factors
  
def assign_ball(factors, blist, ai, b_add_index):
  sum_b = 0
  for index in range(len(factors)-1, 0, -1):
    sum_b += blist[factors[index]-1]
  
  if ai != sum_b%2:
    blist[factors[0]-1] = 1
    b_add_index.append(str(factors[0]))
  return blist, b_add_index

      
N = int(input())
alist = list(map(int, input().split()))
blist = [0 for i in range(N)]
b_add_index = []
for i in range(N-1,-1, -1):
  factors = multiple_factors(i+1, N)
  blist, b_add_index = assign_ball(factors, blist, alist[i], b_add_index)

if sum(blist)%2 != alist[0]:
  print(-1)
else:
  print(len(b_add_index))
  print(" ".join(b_add_index))

Buggy python submission (verdict: Runtime Error):
def multiple_factors(i, N):
  factors = []
  factors.append(int(1*i))
  for index in range(1, N//i):
    factors.append(int(index*i))
  return factors
  
def assign_ball(factors, blist, ai, b_add_index):
  sum_b = 0
  for index in range(len(factors)-1, 0, -1):
    sum_b += blist[factors[index]-1]
  
  if ai != sum_b%2:
    blist[factors[index]-1] =1
    b_add_index.append(str(factors[index]))
  return blist, b_add_index

      
N = int(input())
alist = list(map(int, input().split()))
blist = [0 for i in range(N)]
M = 0
b_add_index = []
for i in range(N-1,-1, -1):
  factors = multiple_factors(i+1, N)
  blist, b_add_index = assign_ball(factors, blist, alist[i], b_add_index)

if sum(blist)%2 != alist[0]:
  print(-1)
else:
  print(len(b_add_index))
  print(" ".join(b_add_index))

Fixed submission:
def multiple_factors(i, N):
  factors = []
  for index in range(0, N//i):
    factors.append(int((index+1)*i))
  return factors
  
def assign_ball(factors, blist, ai, b_add_index):
  sum_b = 0
  for index in range(len(factors)-1, 0, -1):
    sum_b += blist[factors[index]-1]
  
  if ai != sum_b%2:
    blist[factors[0]-1] = 1
    b_add_index.append(str(factors[0]))
  return blist, b_add_index

      
N = int(input())
alist = list(map(int, input().split()))
blist = [0 for i in range(N)]
b_add_index = []
for i in range(N-1,-1, -1):
  factors = multiple_factors(i+1, N)
  blist, b_add_index = assign_ball(factors, blist, alist[i], b_add_index)

if sum(blist)%2 != alist[0]:
  print(-1)
else:
  print(len(b_add_index))
  print(" ".join(b_add_index))