# https://yukicoder.me/problems/no/3526



def main():
    T = input()

    prev = [[-2, -2, -2] for _ in range(len(T) + 1)]
    prev[0][0] = -1
    for i in range(len(T)):
        t = T[i]
        # S
        if t in (".", "S"):
            if prev[i][0] != -2:
                prev[i + 1][1] = ("S", 0)
            if prev[i][1] != -2:
                prev[i + 1][1] = ("S", 1)
            if prev[i][2] != -2:
                prev[i + 1][1] = ("S", 2)
        
        # K
        if t in (".", "K"):
            if prev[i][0] != -2:
                prev[i + 1][0] = ("K", 0)
            if prev[i][1] != -2:
                prev[i + 1][2] = ("K", 1)
            if prev[i][2] != -2:
                prev[i + 1][0] = ("K", 2)

        # G
        if t in (".", "G"):
            if prev[i][0] != -2:
                prev[i + 1][0] = ("G", 0)
            if prev[i][1] != -2:
                prev[i + 1][0] = ("G", 1)

    for j in range(3):
        if prev[-1][j] != -2:
            j0 = j
            ans = []
            index = len(T)
            while prev[index][j0] != -1:
                a, j0 = prev[index][j0]
                index -= 1
                ans.append(a)
            ans.reverse()
            print("Yes")
            print("".join(ans))
            return
        
    print("No")
    return







if __name__ == "__main__":
    main()