N=int(input())

LIST=list(range(1,N+1))

NONEED=[]
for i in range(len(LIST)):
    LIST2=LIST[:i]+LIST[i+1:]

    print("?",len(LIST2),flush=True)
    print(*LIST2,flush=True)
    ans=int(input())

    if ans==1:
        pass
    else:
        NONEED.append(LIST[i])
        

ANS=sorted(set(LIST)-set(NONEED))

print("!",len(ANS),flush=True)
print(*ANS,flush=True)