#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;
if (a[0] == '.') a[0] = 'K';
for (var i = 1; i < n; i++)
{
    if (a[i] != '.') continue;
    if (a[i - 1] == 'S') a[i] = 'G';
    else a[i] = 'K';
}

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

string? Solve()
{
    for (var i = 0; i < n; i++) if (!J(i)) return null;
    return new(a);
}

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