#include <iostream>
#include <fstream>
#include <string.h>
#include <stdio.h>

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

char sir1[4000005], sir2[2000005];
int p[4000005], lg1, lg2;

void f_pref(char s[], int pref[], int n)
{
    pref[0] = 0;
    for (int i = 1; i < n; i++)
    {
        int j = i;
        while (j > 0 && s[pref[j - 1]] != s[i])
        {
            j = pref[j - 1];
        }
        if (j == 0)
            pref[i] = 0;
        else
            pref[i] = pref[j - 1] + 1;
    }
}

int main()
{
    fin >> sir1 >> sir2;
    lg1 = strlen(sir1);
    lg2 = strlen(sir2);
    sir1[lg1] = '#';
    for (int i = lg1 + 1; i <= lg1 + lg2; ++i)
        sir1[i] = sir2[i - lg1 - 1];
    f_pref(sir1, p, lg1 + lg2 + 1);
    int ct = 0;
    for (int i = 0; i <= lg1 + lg2; ++i)
        if (p[i] == lg1)
            ct++;

    fout << ct << '\n';
    ct = 0;
    for (int i = 0; i <= lg1 + lg2; ++i)
        if (p[i] == lg1 && ct < 1000)
        {
            ct++;
            fout << i - lg1 * 2 << ' ';
        }
    return 0;
}