N=int(input())

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

while True:
    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:
            LIST=LIST2
            break
        else:
            continue

    else:
        print("!",len(LIST),flush=True)
        print(*LIST,flush=True)
        break

    if len(LIST)==2:
        print("!",len(LIST),flush=True)
        print(*LIST,flush=True)
        break