#include "bits/stdc++.h"
#include <vector>

using namespace std;

#if defined(ONPC)
#include "bits/debug.h"
#endif

using i64 = long long;

#define uid(a, b) uniform_int_distribution<int>(a, b)(rng)
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

class HashedString {
    private:
        static const int P = 53;
        static const int mod = 1e9 + 7;
        int N = -1;

        vector<int> pw;
        vector<int> ha;

        int mul(int a, int b) { return (i64) a * b % mod; }
        int add(int a, int b) { a += b; if (a >= mod) a -= mod; return a; }
        int sub(int a, int b) { a -= b; if (a < 0) a += mod; return a; }

    public:
        HashedString(const string &s) {
            N = (int)s.size();
            ha = vector<int>(N + 1);
            pw = vector<int>(N + 1);

            pw[0] = 1;
            for (int i = 0; i < N; ++i) {
                ha[i + 1] = add(mul(ha[i],  P), (s[i] - 'A' + 1));
                pw[i + 1] = mul(pw[i], P);
            }
        }

        int get_hash(const int &l, const int &r) { // [l, r)
            return sub(ha[r], mul(ha[l], pw[r - l]));
        }
};

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    freopen("strmatch.in", "r", stdin);
    freopen("strmatch.out", "w", stdout);

    string s, t;
    cin >> s >> t;
    int n = (int)s.size(), m = (int)t.size();
    if (n > m) {
        cout << "0\n";
        return 0;
    }
    vector<int> ans;
    HashedString h_s(s), h_t(t);
    int hs = h_s.get_hash(0, n);
    for (int i = 0; i <= m - n; ++i) {
        int ht = h_t.get_hash(i, i + n);
        if (hs == ht) {
            ans.push_back(i);
        }
        if ((int)ans.size() == 1000 ) break;
    }
    cout << (int)ans.size() << "\n";
    for (int &x : ans) cout << x << ' ';
    cout << "\n";
    return 0;
}