#nullable enable

var n = int.Parse(Console.ReadLine()!);
var s = Console.ReadLine()!.Select(e => e == 'o').ToArray();

for (var i = n % 2 == 0 ? n - 2 : n - 1; i >= 0; i -= 2) s[i] = !s[i];

{
    var c = s.Count(e => !e);
    if (c % 2 == 0)
    {
        Console.WriteLine("Yes");
        foreach (var f in s) Console.Write(f ? "R" : "L");
        Console.WriteLine();
        return;
    }
}
s = [.. s.Select(e => !e)];
{
    var c = s.Count(e => !e);
    if (c % 2 != 0)
    {
        Console.WriteLine("Yes");
        foreach (var f in s) Console.Write(f ? "R" : "L");
        Console.WriteLine();
        return;
    }
}
Console.WriteLine("No");