namespace AtCoder;

#nullable enable

using System.Numerics;

static class Extensions
{
    public static T[] Repeat<T>(this int time, Func<T> F) => Enumerable.Range(0, time).Select(_ => F()).ToArray();
}

class AtCoder
{
    object? Solve()
    {
        var n = Int();
        var az = n.Repeat(Input<long>);
        var iz = new int[n];
        for (var i = 0; i < n; i++) iz[i] = i;
        Array.Sort(az, iz);
        Array.Reverse(az);
        Array.Reverse(iz);
        var t = Math.Min(n, 61);
        for (var i = 0; i < n; i++)
        {
            var xor = az[i];
            var lns = new List<int>(){ iz[i] + 1 };
            for (var d = 1; d < t; d++)
            {
                var j = i + d;
                if (j >= n) break;
                var a = az[j];
                var nxor = xor ^ a;
                if (nxor < xor)
                {
                    lns.Add(iz[j] + 1);
                    xor = nxor;
                }
                if (xor == 0)
                {
                    Out(lns.Count);
                    Out(lns, " ");
                    return null;
                }
            }
        }
        return -1;
    }

    public static void Main() => new AtCoder().Run();
    public void Run()
    {
        var res = Solve();
        if (res != null)
        {
            if (res is bool yes) res = yes ? "Yes" : "No";
            sw.WriteLine(res);
        }
        sw.Flush();
    }

    string[] input = Array.Empty<string>();
    int iter = 0;
    readonly StreamWriter sw = new(Console.OpenStandardOutput()) { AutoFlush = false };

    string String()
    {
        while (iter >= input.Length) (input, iter) = (Console.ReadLine()!.Split(' '), 0);
        return input[iter++];
    }
    T Input<T>() where T : IParsable<T> => T.Parse(String(), null);
    int Int() => Input<int>();
    void Out(object? x, string? separator = null)
    {
        separator ??= Environment.NewLine;
        if (x is System.Collections.IEnumerable obj and not string)
        {
            var firstLine = true;
            foreach (var item in obj)
            {
                if (!firstLine) sw.Write(separator);
                firstLine = false;
                sw.Write(item);
            }
        }
        else sw.Write(x);
        sw.WriteLine();
    }
}