#include <fstream>
#include <cstring>
#include <iostream>
using namespace std;
ifstream f ("strmatch.in");
ofstream g ("strmatch.out");
const int nmax=2e6+3;
int n,m,usu;
char a[nmax],b[nmax];
int pi[nmax],pos[1024];
void make_prefix()
{
    int q=0;
    for(int i=2;i<=m;++i)
    {
        while(q&&a[q+1]!=a[i]) q=pi[q];
        if(a[q+1]==a[i]) ++q;
        pi[i]=q;
    }
}
int main()
{
    int q=0;
    f.getline(a+1,nmax);
    f.getline(b+1,nmax);
    m=strlen(a+1);
    n=strlen(b+1);
    make_prefix();
    for(int i=1;i<=n;++i)
    {
        while(q&&a[q+1]!=b[i]) q=pi[q];
        if(a[q+1]==b[i]) ++q;
        if(q==m)
        {
            q=pi[m];
            ++usu;
            if(usu<=1000) pos[usu]=i-m;
        }
    }
    g<<usu<<'\n';
    for(int i=1;i<=min(usu,1000);++i) g<<pos[i]<<' ';
    return 0;
}