using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var t = ReadLine().ToCharArray();
        if (t[0] == '.') t[0] = 'G';
        if (t[^1] == '.') t[^1] = 'S';
        for (var i = 1; i + 1 < t.Length; ++i) if (t[i] == '.')
        {
            foreach (var ch in "SKG")
            {
                t[i] = ch;
                var flg = false;
                for (var b = i - 2; b <= i; ++b)
                {
                    if (IsSKG(t, Math.Max(0, b), Math.Min(b + 2, t.Length - 1))) flg = true;
                }
                if (!flg) break;
                t[i] = '.';
            }
            if (t[i] == '.')
            {
                WriteLine("No");
                return;
            }
        }
        for (var i = 0; i + 2 < t.Length; ++i)
        {
            if (IsSKG(t, i, i + 2))
            {
                WriteLine("No");
                return;
            }
        }
        WriteLine("Yes");
        WriteLine(string.Concat(t));
    }
    static bool IsSKG(char[] t, int b, int e)
    {
        return e - b == 2 && t[b] == 'S' && t[b + 1] == 'K' && t[e] == 'G';
    }
}