#nullable enable

#region
var (_input, _iter) = (Array.Empty<string>(), 0);
T I<T>() where T : IParsable<T>
{
    while (_iter >= _input.Length) (_input, _iter) = (Console.ReadLine()!.Trim().Split(' '), 0);
    return T.Parse(_input[_iter++], null);
}
#endregion

static T[] Range<T>(int n, Func<T> F) => Enumerable.Range(0, n).Select(_ => F()).ToArray();

var n = I<int>();
var pz = Range(n, () =>  I<int>() - 1);

var ans = new List<int>();
while (true)
{
    var sorted = true;
    for (var i = 0; i < n - 1; i++)
    {
        if (pz[i] == i) continue;
        (pz[i], pz[i + 1]) = (pz[i + 1], pz[i]);
        ans.Add(i + 1);
        sorted = false;
    }
    if (sorted) break;
}

Console.WriteLine("Yes");
Console.WriteLine(ans.Count);
if (ans.Count > 0) Console.WriteLine(string.Join(Environment.NewLine, ans));