Buggy python submission (verdict: Runtime Error):
import sys
input = sys.stdin.readline

def main():
	N = int(input())
	a = list(map(int,input().split()))
	ball = []
	ballNum = 0
	f = [0]*N

	for i in reversed(range(1,N)):
		if (sum(f[0::i+1]) % 2) != (a[i] % 2):
			f[i] = 1
			ball.append(i+1)
			ballNum +=1

	if (sum(f) % 2) != (a[0] % 2):
		f[i] = 1
		ball.append(1)
		ballNum +=1

	print(ballNum)
	print(*ball)

if __name__ == "__main__":
	main()


Fixed submission:
import sys
input = sys.stdin.readline

def sumN(n,N,f):
	total = 0
	i = n
	while i < N:
		total += f[i]
		i += n+1

	if total % 2:
		return 1
	else:
		return 0

def main():
	N = int(input())
	a = list(map(int,input().split()))
	ball = []
	ballNum = 0
	f = [0]*N

	for i in reversed(range(1,N)):
		if sumN(i,N,f) != (a[i] % 2):
			f[i] = 1
			ball.append(i+1)
			ballNum +=1

	if (sum(f) % 2) != (a[0] % 2):
		f[0] = 1
		ball.append(1)
		ballNum +=1

	print(ballNum)
	print(*ball)

if __name__ == "__main__":
	main()

Buggy python submission (verdict: Runtime Error):
import sys
input = sys.stdin.readline

def main():
	N = int(input())
	a = list(map(int,input().split()))
	ball = []
	ballNum = 0
	f = [0]*N

	for i in reversed(range(1,N)):
		if (sum(f[0::i]) % 2) != (a[i] % 2):
			f[i] = 1
			ball.append(i+1)
			ballNum +=1

	if (sum(f) % 2) != (a[0] % 2):
		f[i] = 1
		ball.append(1)
		ballNum +=1

	print(ballNum)
	print(*ball)

if __name__ == "__main__":
	main()


Fixed submission:
import sys
input = sys.stdin.readline

def sumN(n,N,f):
	total = 0
	i = n
	while i < N:
		total += f[i]
		i += n+1

	if total % 2:
		return 1
	else:
		return 0

def main():
	N = int(input())
	a = list(map(int,input().split()))
	ball = []
	ballNum = 0
	f = [0]*N

	for i in reversed(range(1,N)):
		if sumN(i,N,f) != (a[i] % 2):
			f[i] = 1
			ball.append(i+1)
			ballNum +=1

	if (sum(f) % 2) != (a[0] % 2):
		f[0] = 1
		ball.append(1)
		ballNum +=1

	print(ballNum)
	print(*ball)

if __name__ == "__main__":
	main()

Buggy python submission (verdict: Runtime Error):
import sys
input = sys.stdin.readline

def main():
	N = int(input())
	a = list(map(int,input().split()))
	ball = []
	ballNum = 0
	f = [0]*N

	for i in reversed(range(1,N)):
		if (sum(f[0::i]) % 2) != (a[i] % 2):
			f[i] = 1
			ball.append(i+1)
			ballNum +=1

	if (sum(f) % 2) != (a[i] % 2):
		f[i] = 1
		ball.append(i+1)
		ballNum +=1

	print(ballNum)
	print(*ball)

if __name__ == "__main__":
	main()


Fixed submission:
import sys
input = sys.stdin.readline

def sumN(n,N,f):
	total = 0
	i = n
	while i < N:
		total += f[i]
		i += n+1

	if total % 2:
		return 1
	else:
		return 0

def main():
	N = int(input())
	a = list(map(int,input().split()))
	ball = []
	ballNum = 0
	f = [0]*N

	for i in reversed(range(1,N)):
		if sumN(i,N,f) != (a[i] % 2):
			f[i] = 1
			ball.append(i+1)
			ballNum +=1

	if (sum(f) % 2) != (a[0] % 2):
		f[0] = 1
		ball.append(1)
		ballNum +=1

	print(ballNum)
	print(*ball)

if __name__ == "__main__":
	main()

Buggy python submission (verdict: Runtime Error):
import sys
input = sys.stdin.readline

def main():
	N = int(input())
	a = list(map(int,input().split()))
	ball = []
	ballNum = 0
	f = [0]*N

	for i in reversed(range(N)):
		if (sum(f[0::i]) % 2) != (a[i] % 2):
			f[i] = 1
			ball.append(i+1)
			ballNum +=1

	print(ballNum)
	print(*ball)

if __name__ == "__main__":
	main()


Fixed submission:
import sys
input = sys.stdin.readline

def sumN(n,N,f):
	total = 0
	i = n
	while i < N:
		total += f[i]
		i += n+1

	if total % 2:
		return 1
	else:
		return 0

def main():
	N = int(input())
	a = list(map(int,input().split()))
	ball = []
	ballNum = 0
	f = [0]*N

	for i in reversed(range(1,N)):
		if sumN(i,N,f) != (a[i] % 2):
			f[i] = 1
			ball.append(i+1)
			ballNum +=1

	if (sum(f) % 2) != (a[0] % 2):
		f[0] = 1
		ball.append(1)
		ballNum +=1

	print(ballNum)
	print(*ball)

if __name__ == "__main__":
	main()

Buggy python submission (verdict: Time Limit Exceeded):
import sys
input = sys.stdin.readline

def main():
	N = int(input())
	a = list(map(int,input().split()))
	ball = []
	ballNum = 0
	f = [0]*N

	for i in reversed(range(N)):
		if (sum(filter(lambda x: x % (i+1) == 0, f)) % 2) != (a[i] % 2):
			f[i] = 1
			ball.append(i+1)
			ballNum +=1

	print(ballNum)
	print(*ball)

if __name__ == "__main__":
	main()


Fixed submission:
import sys
input = sys.stdin.readline

def sumN(n,N,f):
	total = 0
	i = n
	while i < N:
		total += f[i]
		i += n+1

	if total % 2:
		return 1
	else:
		return 0

def main():
	N = int(input())
	a = list(map(int,input().split()))
	ball = []
	ballNum = 0
	f = [0]*N

	for i in reversed(range(1,N)):
		if sumN(i,N,f) != (a[i] % 2):
			f[i] = 1
			ball.append(i+1)
			ballNum +=1

	if (sum(f) % 2) != (a[0] % 2):
		f[0] = 1
		ball.append(1)
		ballNum +=1

	print(ballNum)
	print(*ball)

if __name__ == "__main__":
	main()

Buggy python submission (verdict: Runtime Error):
import sys
input = sys.stdin.readline

def main():
	N = int(input())
	a = list(map(int,input().split()))
	ball = []
	ballNum = 0
	f = [0*N]

	for i in reversed(range(N)):

		if (sum(filter(lambda x: x % (i+1) == 0, f)) % 2) != (a[i] % 2):
			f[i] = 1
			ball.append(i+1)
			ballNum +=1

	print(ballNum)
	print(*ball)

if __name__ == "__main__":
	main()


Fixed submission:
import sys
input = sys.stdin.readline

def sumN(n,N,f):
	total = 0
	i = n
	while i < N:
		total += f[i]
		i += n+1

	if total % 2:
		return 1
	else:
		return 0

def main():
	N = int(input())
	a = list(map(int,input().split()))
	ball = []
	ballNum = 0
	f = [0]*N

	for i in reversed(range(1,N)):
		if sumN(i,N,f) != (a[i] % 2):
			f[i] = 1
			ball.append(i+1)
			ballNum +=1

	if (sum(f) % 2) != (a[0] % 2):
		f[0] = 1
		ball.append(1)
		ballNum +=1

	print(ballNum)
	print(*ball)

if __name__ == "__main__":
	main()