#include <fstream>
#include <iostream>
#include <string>
#include <vector>

using namespace std;

ifstream fin("strmatch.in");
ofstream fout("strmatch.out");

const int LEN_MAX = 2e6 + 5;

string A, B;
int pi[LEN_MAX];

vector <int> Ans;

int main() {
    ios_base::sync_with_stdio(false);
    fin.tie(NULL);
    fout.tie(NULL);

    fin >> A >> B;
    A = " " + A;
    B = " " + B;
    pi[1] = 0;
    int k = 0;
    for (int i = 2; i < A.size(); i++) {
        while (k > 0 && A[i] != A[k + 1]) {
            k = pi[k];
        }
        if (A[i] == A[k + 1]) {
            k++;
        }
        pi[i] = k;
    }

    int q = 0;
    for (int i = 1; i < B.size(); i++) {
        while (q > 0 && A[q + 1] != B[i]) {
            q = pi[q];
        }
        if (A[q + 1] == B[i]) {
            q++;
        }
        if (q == A.size() - 1) {
            Ans.push_back(i - A.size() + 1);
        }
    }

    fout << Ans.size() << "\n";
    int cnt = 0;
    for (int pos : Ans) {
        cnt++;
        fout << pos << " ";
        if (cnt == 1000) {
            break;
        }
    }
    return 0;
}