T=input()

flag=0
for i in range(len(T)-3):
    if T[i]=="S" and T[i+1]=="K" and T[i+2]=="G":
        flag=1

if flag==1:
    print("No")

else:
    print("Yes")
    ANS=[]
    for i in range(len(T)):
        if T[i]==".":
            if len(ANS)>=2 and ANS[-1]=="K" and ANS[-2]=="S":
                ANS.append("K")
            else:
                ANS.append("G")
        else:
            ANS.append(T[i])

    print("".join(ANS))