#include<fstream>
#include<cstring>
using namespace std;
int n, m, i, L, p[2000003], nrsol, sol[1003];
char a[2000003], b[2000003];
ifstream in("strmatch.in");
ofstream out("strmatch.out");
int main()
{
    in>>a+1>>b+1;
    n=strlen(a+1);
    m=strlen(b+1);
    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){
                L=p[L];
                nrsol++;
                if(nrsol<1001)
                    sol[nrsol]=i-n;
            }

        }
    }
    out<<nrsol<<"\n";
    for(i=1; i<=min(nrsol, 1000); i++)
        out<<sol[i]<<" ";
    return 0;
}