#include <string>
#include <fstream>
#include <vector>
#include <iostream>
using namespace std;

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

string a, b, c;
int l1, l2;
vector<int> aparitii;
int pi[2000005];

int main() {
    a = b = " ";
    fin >> c;
    a += c;
    fin >> c;
    b += c;
    l1 = a.length()-1, l2 = b.length()-1;

    int k = 0;
    for(int i = 2; i <= l1; i++) {
        while(k > 0 && a[k+1] != a[i])
            k = pi[k];
        if(a[k+1] == a[i])
            k++;
        pi[i] = k;
    }

    int q = 0;
    for(int i = 1; i <= l2; i++) {
        while(q > 0 && (a[q+1] != b[i]))
            q = pi[q];
        if(a[q+1] == b[i])
            q++;
        if(q == l1)
            aparitii.push_back(i-l1);
    }

    fout << aparitii.size() << '\n';
    if(aparitii.size() > 1000)
        for(int i = 0; i < 1000; i++)
            fout << aparitii[i] << ' ';
    else
        for(auto nr: aparitii)
            fout << nr << ' ';
}