s = input()
if len(s) < 3 :
	print("Yes")
	print(s.replace(".", "S"))
	exit()
if "SKG" in s :
	print("No")
else :
	print("Yes")
	pre = "."
	nxt = "."
	for (i, c) in enumerate(s) :
		if c != "." :
			print(c, end="")
			continue
		pre = ("." if i == 0 else s[i-1])
		nxt = ("." if i == len(s)-1 else s[i+1])
		if pre == "K" or nxt == "K" :
			c = "K"
		elif pre == "S" and nxt == "G" :
			c = "S"
		else :
			c = "K"
		print(c, end="")
	print("")