#include <fstream>
#include <cstring>
using namespace std;
ifstream fin ("strmatch.in");
ofstream fout ("strmatch.out");
int n,m,i,l,nr,p[2000002],v[1002];
char a[2000002],b[2000002];
int main()
{
    fin>>a+1;
    fin>>b+1;
    n=strlen (a+1);
    m=strlen (b+1);
    l=0;
    p[1]=0;
    for (i=2; i<=n; i++)
    {
        while (l!=0&&a[i]!=a[l+1])
            l=p[l];
        if (a[i]==a[l+1])
            l++;
        p[i]=l;
    }
    l=0;
    for (i=1; i<=m; i++)
    {
        while (l!=0&&b[i]!=a[l+1])
            l=p[l];
        if (b[i]==a[l+1])
            l++;
        if (l==n)
        {
            nr++;
            if (nr<=1000)
                v[nr]=i-n;
            l=p[l];
        }
    }
    fout<<nr<<"\n";
    if (nr>1000)
        nr=1000;
    for (i=1; i<=nr; i++)
        fout<<v[i]<<" ";
    return 0;
}