import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################

"""


"""

s = input()
if "SKG" in s:
    No()
else:
    s = list(s)
    for i in range(len(s)):
        if s[i] != ".":
            continue
        if i and s[i-1] == "S":
            s[i] = "G"
        else:
            s[i] = "K"
    Yes()
    print("".join(s))