using System;
using System.Text;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using static System.Console;
using static System.Math;

namespace AtCorder
{
    class Program
    {
        static void Main(string[] args)
        {
            new Program().Solve(new ConsoleInput(Console.In, ' '));
        }
        public void Solve(ConsoleInput cin)
        {
            var N = cin.ReadInt;
            var a = cin.ReadIntArray(N);
            int[] b = new int[N];
            for(int i = 0; i < N; i++)
            {
                b[i] = 0;
            }
            var sum = 0;
            for(int i = N; i > (N+ 1) / 2; i--)
            {
                if(a[i-1] == 0)
                {
                    b[i-1] = 0;
                }
                else
                {
                    b[i-1] = 1;
                }
            }
            var t = (N + 1) / 2;
            for (int i = (N+1)/2; i > 0; i--)
            {
                var temp = 0;
                for(int j = 1; j * i <= N; j++)
                {
                    if(b[j*i-1] == 1)
                    {
                        temp++;
                    }
                }
                if (temp % 2 == 1)
                {
                    if (a[i - 1] == 1)
                    {
                        b[i - 1] = 0;
                    }
                    else
                    {
                        b[i - 1] = 1;
                    }
                }
                else
                {
                    if (a[i - 1] == 1)
                    {
                        b[i - 1] = 1;
                    }
                    else
                    {
                        b[i - 1] = 0;
                    }
                }
            }
            for(int i = 0; i < N; i++)
            {
                if(b[i] == 1)
                {
                    sum++;
                }
            }
            WriteLine(sum);
            for (int i = 0; i < N; i++) {
                if(b[i] == 1)
                {
                    WriteLine(i + 1);
                }
            }
        }
    }

    public class ConsoleInput
    {
        private readonly System.IO.TextReader _stream;
        private char _separator = ' ';
        private Queue<string> inputStream;
        public ConsoleInput(System.IO.TextReader stream, char separator = ' ')
        {
            this._separator = separator;
            this._stream = stream;
            inputStream = new Queue<string>();
        }
        public string Read
        {
            get
            {
                if (inputStream.Count != 0) return inputStream.Dequeue();
                string[] tmp = _stream.ReadLine().Split(_separator);
                for (int i = 0; i < tmp.Length; ++i)
                    inputStream.Enqueue(tmp[i]);
                return inputStream.Dequeue();
            }
        }
        public string ReadLine { get { return _stream.ReadLine(); } }
        public int ReadInt { get { return int.Parse(Read); } }
        public long ReadLong { get { return long.Parse(Read); } }
        public double ReadDouble { get { return double.Parse(Read); } }
        public string[] ReadStrArray(long N) { var ret = new string[N]; for (long i = 0; i < N; ++i) ret[i] = Read; return ret; }
        public int[] ReadIntArray(long N) { var ret = new int[N]; for (long i = 0; i < N; ++i) ret[i] = ReadInt; return ret; }
        public long[] ReadLongArray(long N) { var ret = new long[N]; for (long i = 0; i < N; ++i) ret[i] = ReadLong; return ret; }
    }
}


Measured memory_bytes: 30808