/**
 * Created at 20:58 on 2019-07-20
 */

import java.io.*;
import java.util.*;

public class Main {

  static FastScanner sc = new FastScanner();
  static PrintStream out = System.out;
  static PrintWriter pw = new PrintWriter(out);

  static final int[] dx = {0, 1, 0, -1};
  static final int[] dy = {-1, 0, 1, 0};

  static final long MOD = (long) (1e9 + 7);
  static final long INF = Long.MAX_VALUE / 2;

  public static class Solver {
    public Solver() {

      int N = sc.nextInt();

      int[] A = sc.nextIntArray(N, false);
/*
      int[] A = new int[N];

      for (int i=0; i<N; i++) {
        if (Math.random() > 0.5) {
          A[i] = 1;
        }
      }
*/
      int[] ans = new int[N];

      for (int i=N-1; i>=0; i--) {
        if (A[i] == 1) {
          ans[i] = 1;
          int[] factors = getFactors(i+1);
          for (int j=0; j<factors.length-1; j++) {
            A[factors[j]-1] = 1 - A[factors[j]-1];
          }
        }
      }

      int count = 0;
      for (int i=0; i<N; i++) {
        if (ans[i] == 1) count++;
      }

      out.println(count);
      for (int i=0; i<N; i++) {
        if (ans[i] == 1) out.println(i+1);
      }
    }

    /*
     * 約数を小さい順に並べた配列を返す
     */
    public int[] getFactors(int n) {
      ArrayList<Integer> f1 = new ArrayList();
      ArrayList<Integer> f2 = new ArrayList();
      int bound = (int)Math.sqrt(n);
      for (int i=1; i<=bound; i++) {
        if (n % i == 0) {
          f1.add(i);
          f2.add(n/i);
        }
      }

      if (bound * bound == n) f2.remove(f2.size()-1);

      int[] factors = new int[f1.size() + f2.size()];

      for (int i=0; i<f1.size(); i++) {
        factors[i] = f1.get(i);
      }

      for (int i=0; i<f2.size(); i++) {
        factors[f1.size()+i] = f2.get(f2.size()-i-1);
      }

      return factors;
    }

  }

  public static void main(String[] args) {
    new Solver();
  }

  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;
    }

    private void skipUnprintable() {
      while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;
    }

    public boolean hasNext() {
      skipUnprintable();
      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() {
      return (int) nextLong();
    }

    public int[] nextIntArray(int N, boolean oneBased) {
      if (oneBased) {
        int[] array = new int[N + 1];
        for (int i = 1; i <= N; i++) {
          array[i] = sc.nextInt();
        }
        return array;
      } else {
        int[] array = new int[N];
        for (int i = 0; i < N; i++) {
          array[i] = sc.nextInt();
        }
        return array;
      }
    }

    public long[] nextLongArray(int N, boolean oneBased) {
      if (oneBased) {
        long[] array = new long[N + 1];
        for (int i = 1; i <= N; i++) {
          array[i] = sc.nextLong();
        }
        return array;
      } else {
        long[] array = new long[N];
        for (int i = 0; i < N; i++) {
          array[i] = sc.nextLong();
        }
        return array;
      }
    }
  }

}


Measured memory_bytes: 54252