#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

var t = I<string>();
var a = t.ToCharArray();
var n = t.Length;

bool J(int start)
{
    if (start < 0 || start + 2 >= n) return true;
    return a[start] != 'S' || a[start + 1] != 'K' || a[start + 2] != 'G';
}

bool JJ(int p)
{
    for (var i = p - 2; i <= p + 2; i++) if (!J(i)) return false;
    return true;
}

string? Solve()
{
    var a = t.ToCharArray();
    for (var i = 0; i < n; i++)
    {
        if (a[i] == '.')
        {
            a[i] = 'K';
            if (!JJ(i)) a[i] = 'G';
        }
        else if (!JJ(i)) return null;
    }
    return new(a);
}

var ans = Solve();
if (ans == null) Console.WriteLine("No");
else
{
    Console.WriteLine("Yes");
    Console.WriteLine(ans);
}