#include <bits/stdc++.h>
#define MAXSZ 2000005

using namespace std;

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

char a[MAXSZ], b[MAXSZ];
int lps[MAXSZ];

int main() {
    fin.getline(a, MAXSZ);
    fin.getline(b, MAXSZ);
    int aSz = (int)strlen(a);
    int bSz = (int)strlen(b);


    int q = 0;
    for (int i = 2; i <= aSz; i++) {
        while (q && a[q] != a[i - 1])
            q = lps[q];
        if (a[q] == a[i - 1])
            q++;
        lps[i] = q;
    }

    vector<int> matches;
    q = 0;
    for (int i = 0; i < bSz; i++) {
        while (q && a[q] != b[i])
            q = lps[q];
        if (a[q] == b[i])
            q++;
        if (q == aSz) {
            matches.push_back(i - aSz + 1);
            q = lps[q];
        }
    }

    fout << matches.size() << '\n';
    for (auto& match: matches)
        fout << match << ' ';
    return 0;
}