#include <iostream>
#include <bits/stdc++.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;
}