import sys

T = input()

# T = 'S.K.G'

for i in range(len(T) - 2):
    # print(T[i])
    if T[i] == 'S' and T[i + 1] == 'K' and T[i + 2] == 'G':
        print('No')
        sys.exit()

print('Yes')
ans = []
for i in range(len(T)):
    if T[i] != '.':
        ans.append(T[i])
    else:
        if i == 0:
            ans.append('G')
        elif i == len(T) - 1:
            ans.append('S')
        else:
            ans.append(T[i - 1])
print("".join(ans))