Buggy python submission (verdict: Time Limit Exceeded):
import sys
from collections import Counter 

N,*a = map(int,open(0).read().split())
for i in range(1<<N):
    bit_str = format(i,'b').zfill(N)
    r_bit_str = list(reversed(bit_str))
    flg = True
    ans = []
    for j in range(N):
        parts_bit = r_bit_str[j::j+1]
        c = Counter(parts_bit)
        sum1 = c["1"]
        if sum1 % 2 != a[j]:
            flg = False
            break
        elif a[j] == 1:
            ans.append(str(j+1))
    if flg:
        print(len(ans))
        print(" ".join(ans))
        sys.exit()
print(-1)  
    

Fixed submission:
from collections import Counter

N,*a = map(int,open(0).read().split())
ans = []
for i in range(N)[::-1]:
    part_rem = sum(a[i::i+1]) % 2
    if a[i] == 0:
        if part_rem == 1:
            a[i] = abs(a[i] - 1) 
    elif a[i] == 1:
        if part_rem == 0:
            a[i] = abs(a[i] - 1)
            
c = Counter(a)            
print(c[1])
for i in range(N):
    if a[i] == 1:
        print(i+1,end=" ")
print()

Buggy python submission (verdict: Time Limit Exceeded):
import sys
from collections import Counter 

N,*a = map(int,open(0).read().split())
for i in range(1<<N):
    bit_str = format(i,'b').zfill(N)
    r_bit_str = list(reversed(bit_str))
    flg = True
    for j in range(N):
        parts_bit = r_bit_str[j::j+1]
        c = Counter(parts_bit)
        sum1 = c["1"]
        if sum1 % 2 != a[j]:
            flg = False
            break
    if flg:
        ans = []
        for i in range(len(r_bit_str)):
            if r_bit_str[i] == "1":
                ans.append(str(i+1))
        print(len(ans))
        print(" ".join(ans))
        sys.exit()
print(-1)  
    

Fixed submission:
from collections import Counter

N,*a = map(int,open(0).read().split())
ans = []
for i in range(N)[::-1]:
    part_rem = sum(a[i::i+1]) % 2
    if a[i] == 0:
        if part_rem == 1:
            a[i] = abs(a[i] - 1) 
    elif a[i] == 1:
        if part_rem == 0:
            a[i] = abs(a[i] - 1)
            
c = Counter(a)            
print(c[1])
for i in range(N):
    if a[i] == 1:
        print(i+1,end=" ")
print()

Buggy python submission (verdict: Time Limit Exceeded):
import sys

N,*a = map(int,open(0).read().split())
for i in range(1<<N):
    bit_str = list(reversed(str(i).zfill(N)))
    flg = True
    for j in range(N):
        parts_bit = bit_str[j::j+1]
        _sum = 0
        for k in parts_bit:
            _sum += int(k)
        if _sum % 2 != a[j]:
            flg = False
            continue
    if flg:
        ans = []
        for i in range(len(bit_str)):
            if bit_str[i] == "1":
                ans.append(str(i+1))
        print(len(ans))
        print(" ".join(ans))
        sys.exit()
print(-1)  

    

Fixed submission:
from collections import Counter

N,*a = map(int,open(0).read().split())
ans = []
for i in range(N)[::-1]:
    part_rem = sum(a[i::i+1]) % 2
    if a[i] == 0:
        if part_rem == 1:
            a[i] = abs(a[i] - 1) 
    elif a[i] == 1:
        if part_rem == 0:
            a[i] = abs(a[i] - 1)
            
c = Counter(a)            
print(c[1])
for i in range(N):
    if a[i] == 1:
        print(i+1,end=" ")
print()

Buggy python submission (verdict: Time Limit Exceeded):
import sys

N,*a = map(int,open(0).read().split())
for i in range(1<<N):
    bit_str = list(reversed(str(i).zfill(N)))
    flg = True
    for j in range(N):
        parts_bit = bit_str[j::j+1]
        _sum = 0
        for k in parts_bit:
            _sum += int(k)
        if _sum % 2 != a[j]:
            flg = False
            continue
    if flg:
        ans = []
        for i in range(len(bit_str)):
            if bit_str[i] == "1":
                ans.append(str(i+1))
        print(len(ans))
        print(" ".join(ans))
        sys.exit()
print(-1)  

    

Fixed submission:
from collections import Counter

N,*a = map(int,open(0).read().split())
ans = []
for i in range(N)[::-1]:
    part_rem = sum(a[i::i+1]) % 2
    if a[i] == 0:
        if part_rem == 1:
            a[i] = abs(a[i] - 1) 
    elif a[i] == 1:
        if part_rem == 0:
            a[i] = abs(a[i] - 1)
            
c = Counter(a)            
print(c[1])
for i in range(N):
    if a[i] == 1:
        print(i+1,end=" ")
print()