import java.util.*;
import java.awt.List;
import java.io.*;

public class Main {

	public static void main(String[] args) {
		FastScanner sc = new FastScanner();
		PrintWriter out = new PrintWriter(System.out);
		
		int n = sc.nextInt();
		int[] a = new int[n + 1];
		for(int i = 1; i <=n; i++)
			a[i] = sc.nextInt();
		
		int M = 0;
		int[] flag = new int[n + 1];
		for(int i = n; i > 0; i--) {
			//out.print("i:" + i + "  ");
			int cnt = 0;
			for(int j = i; j <= n; j += i) {
				//out.print("j:" + j  + " ");
				if (flag[j] == 1) cnt++;
				}
			//out.println("cnt:" + cnt);
			if (cnt % 2 == 1&& a[i] == 0 || cnt % 2 == 0 && a[i] == 1) {
				flag[i] = 1;
				M++;
			}
			}
		out.println(M);
		for(int i = 1; i <= n; i++) {
			if (flag[i] == 1)
				out.print(i + " ");
		}	
		
			
		out.close();
	}
	//約数を求める
	static ArrayList<Integer> func(int n) {
		ArrayList<Integer> ret = new ArrayList<>();
		int num = (int)Math.sqrt((double)n);
		for(int i = 1; i <= num; i++) {
			if (n % i == 0) {
				int j = n / i;
				ret.add(i);
				ret.add(j);
			}
		}
		return ret;
	}

static class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        }else{
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
    private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
    private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
    public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; return hasNextByte();}
    public String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while(isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public long nextLong() {
        if (!hasNext()) throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b)){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
        return (int) nl;
    }
    public double nextDouble() { return Double.parseDouble(next());}
}
}


Measured memory_bytes: 38316