def ask(aa):
    if len(aa)==1:return 0
    if len(aa)==n:return 1
    print("?", len(aa), flush=True)
    print(*aa, flush=True)
    return int(input())

n = int(input())
ans=[]
for i in range(1,n):
    if ask(ans+list(range(i+1,n+1)))==0:
        ans.append(i)

if ask(ans)==0:ans.append(n)

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