#include <fstream>
#include <cstring>
using namespace std;
ifstream cin("strmatch.in");
ofstream cout("strmatch.out");
const int NMAX = 2e6+5;
//2 4 8 16 32 64 128 256 5
int n,m,pi[NMAX],pos[(1<<10)];
char a[NMAX],b[NMAX];
void make_prefix()
{
    int q=0,i;
    for(i=2,pi[1]=0;i<=n;++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,nr=0;
    cin>>a>>b;
    n=strlen(a);
    m=strlen(b);
    for(int i=n;i;i--)
        a[i]=a[i-1];
    a[0]=' ';
    for(int i=m;i;--i)
    b[i]=b[i-1];
    b[0]=' ';
    make_prefix();
    for(int i=1;i<=m;i++)
    {
        while(q && a[q+1]!=b[i])
            q=pi[q];
        if(a[q+1]==b[i])
            q++;
        if(q==n)
        {
            q=pi[n];
            ++nr;
            if(nr<=1000)
                pos[nr]=i-n;
        }
    }
    cout<<nr<<endl;
    for(int i=1;i<=min(nr,1000);++i)
        cout<<pos[i]<<" ";
    return 0;
}