import sys
from random import *
N=int(input())
P=list(range(N))
shuffle(P)
def query(a,b):
  print('?',P[a]+1,P[b]+1)
  sys.stdout.flush()
  return int(input())

def answer(C):
  print('!')
  print(len(C))
  print(*[P[C[i]]+1 for i in range(len(C))])
  sys.stdout.flush()
  exit()

def f(X):
  if len(X)<=1:
    return X
  v=X[0]
  a=[]
  b=[]
  for i in range(1,len(X)):
    if query(v,X[i]):
      b.append(X[i])
    else:
      a.append(X[i])
  p,q=f(a),f(b)
  return p+[v]+q

answer(f(list(range(N))))