/**
⚡⚡ ⚡⚡ ⚡⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡⚡⚡⚡⚡ ⚡⚡⚡⚡⚡ ⚡⚡⚡⚡⚡⚡ ⚡⚡⚡⚡⚡⚡
⚡⚡ ⚡⚡ ⚡⚡⚡⚡ ⚡⚡⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡⚡⚡⚡⚡
⚡⚡⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡⚡⚡⚡ ⚡⚡⚡⚡⚡⚡ ⚡⚡
⚡⚡ ⚡⚡ ⚡⚡⚡⚡⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡
⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡⚡⚡⚡⚡ ⚡⚡⚡⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡
**/
#include<bits/stdc++.h>
using namespace std;
#define fto(i, a, b) for(int i = a; i <= b; ++i)
#define fdto(i, a, b) for(int i = a; i >= b; --i)
#define bugarr(a, i, j) cout << #a << "{" << i << "..." << j << "}:"; fto(k, i, j-1) cout << a[k] << ", "; cout << a[j] << endl;
#define ll long long
#define db double
#define ldb long double
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define vt vector
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define trav(i, a) for(auto &i : a)
#define sz(a) (int)a.size()
#define pi(a, b) pair<a, b>
#define fast ios::sync_with_stdio(false); cin.tie(0)
void setIO(string s) {
if (sz(s) != 0) {
freopen((s+".inp").c_str(),"r",stdin);
freopen((s+".out").c_str(),"w",stdout);
}
}
void setIOusaco(string s) {
if (sz(s) != 0) {
freopen((s+".in").c_str(),"r",stdin);
freopen((s+".out").c_str(),"w",stdout);
}
}
template<typename T, typename V>
bool ckmin(T &a, V b) {return (b < a)? a = b, true : false;}
template<typename T, typename V>
bool ckmax(T &a, V b) {return (b > a)? a = b, true : false;}
void print(int x) {cout << x;}
void print(long long x) {cout << x;}
void print(unsigned x) {cout << x;}
void print(unsigned long long x) {cout << x;}
void print(double x) {cout << fixed << x;}
void print(long double x) {cout << fixed << x;}
void print(char x) {cout << "'" << x << "'";}
void print(string x) {cout << '"' << x << '"';}
void print(bool x) {cout << (x ? "true" : "false");}
template<typename T, typename V>
void print(const pair<T, V> &x) {cout << '{'; print(x.ff); cout << ", "; print(x.ss); cout << '}';}
template<typename T>
void print(const T &x) {int f = 0; cout << '{'; for (auto &i: x) cout << (f++ ? ", " : ""), print(i); cout << "}";}
void _print() {cout << "]" << endl;}
template <typename T, typename... V>
void _print(T t, V... v) {print(t); if (sizeof...(v)) cout << ", "; _print(v...);}
#ifdef TAP
#define bug(x...) cout << "[" << #x << "] = ["; _print(x)
#else
#define bug(x...)
#endif
pair<int, int> g[(1<<10) + 7][(1<<10) + 7][27];
int f[100008];
int main() {
#ifndef TAP
setIO("");
//setIOusaco("longest_beautiful_sequence");
#endif
fast;
int n;
cin >> n;
vt<int> a(n+1);
vt<int> h(n+1);
fto(i, 1, n) cin >> a[i];
fto(i, 1, n) cin >> h[i];
int ans = 0;
int anspos;
fto(j, 1, n) {
int firsthalf = (a[j]&((1<<10)-1));
int secondhalf = (firsthalf^a[j]);
int res = 0;
int pos = 0;
fto(i, 0, (1<<10)-1) {
if (ckmax(res, g[i][secondhalf][h[j]-__builtin_popcount(firsthalf&i)].ff+1)) {
pos = g[i][secondhalf][h[j]-__builtin_popcount(firsthalf&i)].ss;
}
}
f[j] = pos;
if (ckmax(ans, res)) {
anspos = j;
}
fto(i, 0, (1<<10)-1) {
if (ckmax(g[firsthalf][i][__builtin_popcount(secondhalf&i)].ff, res)) {
g[firsthalf][i][__builtin_popcount(secondhalf&i)].ss = j;
}
}
}
cout << ans << '\n';
vt<int> trace;
while(anspos != 0) {
trace.pb(anspos);
anspos = f[anspos];
}
reverse(all(trace));
fto(i, 0, sz(trace)-1) {
cout << trace[i] << " \n"[i == sz(trace)-1];
}
return 0;
}
