import sys
input = sys.stdin.readline
T = input().strip()
N = len(T)
if "SKG" in T:
    print("No")
    exit()
ans = []
for i in range(N):
    t = T[i]
    if t==".":
        if len(ans)==0 or ans[-1]=="K":
            ans.append("K")
        elif ans[-1]=="S":
            ans.append("G")
        else:
            if i+1<N and T[i]=="K":
                ans.append("G")
            else:
                ans.append("S")
    else:
        ans.append(t)
print("Yes")
print("".join(ans))