#include <bits/stdc++.h>
#ifdef LOCAL
#include "debug/debug.hpp"
#else
#define print(...)
#endif
using ll = long long;
using ld = long double;
using ull = unsigned long long;
#define str string
#define all(v) v.begin(), v.end()
#define fi first
#define se second
#define ent cout << "\n";
#define sz(v) ll(v.size())
using namespace std;
const long long MOD = 1e9 + 7, inf = 1e18;
void solve() {
    ll n, m;
    cin >> n >> m;
    ll a[n + 17];
    ll a2[n + 17];
    for (ll i = 1; i <= n; i++) {
        cin >> a2[i];
        a[a2[i]] = i;
    }
    ll b[m + 17];
    for (ll i = 1; i <= m; i++) {
        cin >> b[i];
    }
    vector<ll> ans;
    for (ll i = 1; i + n - 1 <= m; i++) {
        ll z[n + 17];
        for (ll j = i; j - i + 1 <= n; j++) {
            z[a[j - i + 1]] = b[j];
        }
        ll ok = 1;
        for (ll j = 1; j < n; j++) {
            if (z[j] > z[j + 1]) ok = 0;
        }
        if (ok) {
            ans.push_back(i);
        }
        // print(t);
    }
    cout << sz(ans) << '\n';
    for (auto c : ans) {
        cout << c << ' ';
    }
    ent;
}
int32_t main() {
#ifdef ONLINE_JUDGE
    // freopen("input.txt","r",stdin);
    // freopen("output.txt","w",stdout);
#endif
    ios_base::sync_with_stdio(false), cin.tie(0), cout.tie(0);
    ll ttest = 1;
    // cin >> ttest;
    for (ll test_number = 1; test_number <= ttest; test_number++) {
        solve();
    }
    return 0;
}
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