#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define ll int
#define ld long double
#define str string
#define pb push_back
#define pf push_front
#define pob pop_back()
#define pof pop_front()
#define in insert
#define fi first
#define se second
#define size size()
#define begin begin()
#define end end()
#define back back()
#define front front()
#define rend rend()
#define rbegin rbegin()
#define ret return
#define ull unsigned long long
#define all(a) a.begin , a.end
#define gcd __gcd
#define lcm(a , b) (a * b) / gcd(a , b)
#define friopen freopen ("exercise.in", "r", stdin); freopen("exercise.out", "w", stdout);
using namespace std;
using namespace __gnu_pbds;
typedef tree<long long, null_type, less_equal<long long>, rb_tree_tag, tree_order_statistics_node_update> pbds;
const ll mod = 1e9 + 7 , mod2 = 998244353 , N = 1e6 , inf = 0;
const ld esp = 0.0000001 , Pi = 3.1415926535897932384626433832795;
ll p[N + 12] , node[4 * N + 12] , s[4 * N + 12];
void update(ll ind , ll v , ll x = 1 , ll l = 1 , ll r = N)
{
if (r < ind || l > ind) ret ;
if (l == r)
{
// cout<<l<<endl;
node[x] = v;
s[x] = (v != 0);
ret;
}
else
{
ll m = (l + r) / 2;
update(ind , v , 2 * x , l , m);
update(ind , v , 2 * x + 1 , m + 1 , r);
node[x] = (node[2 * x]*1LL + (node[2 * x + 1]*1LL * p[s[2 * x]]%mod * 1LL) % mod) % mod;
s[x] = s[2 * x] + s[2 * x + 1];
}
}
ll a[N + 12] , b[N+12];
pair<ll , ll> b2[N + 12];
void kol_a()
{
ll n , m , i , j;
cin >> n >> m;
deque<ll> ans;
for (i = 1 ; i <= n ; i ++) cin >> a[i];
for (i = 1 ; i <= m ; i ++)
{
cin >> b[i];
b2[i] = {b[i] , i};
}
sort(b2 + 1 , b2 + 1+ m);
for(i = 1 ; i <= m ; i ++) b[b2[i].se] = b2[i].fi;a
for (i = 1 ; i <= n ; i ++)
{
v1 = (v1*1LL + (a[i] * 1LL*p[i - 1])%mod ) % mod;
v2 = (v2*1LL +p[i - 1])%mod;
}
for (i = 1 ; i <= n ; i ++) update(b[i] , i);
if (v1 == node[1]) ans.pb(1);
for (i = 2 ; i + n - 1 <= m ; i ++)
{
update(b[i - 1] , 0);
update(b[i + n - 1] , i + n - 1);
v1 = (v1 + v2*1LL) % mod;
if (v1 == node[1]){ ans.pb(i);}
}
cout << ans.size << '\n';
for (auto x : ans) cout << x << " ";
cout<<endl;
}
main()
{
// friopen
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
ll _ = 1;
while(_ --) kol_a();
}
/*
*/
