T = input()
N = len(T)

for i in range(N-2):
    if T[i:i+3] == "SKG":
        print("No")
        exit()

T = list(T)
for i in range(N):
    if T[i] != ".":
        continue

    for w in ["S","K","G"]:
        T[i] = w
        flag = True
        for s in range(-2,1):
            if s < 0 or s+3 > N:
                continue
            if T[s:s+3] == ["S","K","G"]:
                flag = False
        if flag:
            break

print("Yes")
print("".join(T))