T = input()

if "SKG" in T:
    print("No")
else:
    print("Yes")
    T = list(T)
    N = len(T)
    for i in range(N):
        if T[i] == ".":
            if i > 0:
                if T[i - 1] == "S":
                    T[i] = "G"
                else:
                    T[i] = T[i - 1]
            else:
                T[i] = "G"
    S = "".join(T)
    assert "SKG" not in S and "." not in S
    print(S)