/* imports all std modules {{{*/
import
  std.algorithm,
  std.array,
  std.ascii,
  std.base64,
  std.bigint,
  std.bitmanip,
  std.compiler,
  std.complex,
  std.concurrency,
  std.container,
  std.conv,
  std.csv,
  std.datetime,
  std.demangle,
  std.encoding,
  std.exception,
  std.file,
  std.format,
  std.functional,
  std.getopt,
  std.json,
  std.math,
  std.mathspecial,
  std.meta,
  std.mmfile,
  std.net.curl,
  std.net.isemail,
  std.numeric,
  std.parallelism,
  std.path,
  std.process,
  std.random,
  std.range,
  std.regex,
  std.signals,
  std.socket,
  std.stdint,
  std.stdio,
  std.string,
  std.system,
  std.traits,
  std.typecons,
  std.uni,
  std.uri,
  std.utf,
  std.uuid,
  std.variant,
  std.zip,
  std.zlib;
/*}}}*/

/+---test
3
1 0 0
---+/
/+---test
5
0 0 0 0 0
---+/

void main(string[] args) {
  readln;
  const A = readln.split.map!(to!long).array;
  const N = A.length;

  auto boxes = new bool[N];
  foreach_reverse (i; 1..N+1) {
    long x;
    for (long j = i*2; j <= boxes.length; j+=i) {
      x += boxes[j-1];
    }
    boxes[i-1] = (x%2 != A[i-1]);
  }

  size_t[] ans;
  foreach (i, v; boxes) if (v) ans ~= i+1;

  ans.length.writeln;
  foreach (i, v; ans) {
    if (i != 0) " ".write;
    v.write;
  }
  writeln;
}
