#include <bits/stdc++.h>
#define Nmax 2000006
using namespace std;

char A[Nmax], B[Nmax];
int prefix[Nmax], k, n, m;
vector <int> solution;

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

int main() {
    fin >> A >> B;
    n = strlen(A);
    m = strlen(B);
    if (n > m) return !(cout << 0);
    for (int i = 1; i < n; i++) {
        while (k && A[k] != A[i])
            k = prefix[k - 1];
        if (A[k] == A[i])
            k++;
        prefix[i] = k;
    }
    k = 0;
    for (int i = 0; i < m; i++) {
        while (k && A[k] != B[i])
            k = prefix[k - 1];
        if (A[k] == B[i])
            k++;
        if (k == n) {
            if (solution.size() <= 1000)
                solution.push_back(i - n + 1);
            k = prefix[k - 1];
        }
    }

    fout << solution.size() << "\n";
    for (int i = 0; i < solution.size(); i++)
        fout << solution[i] << " ";
}