#include <bits/stdc++.h>

using namespace std;
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");

const int p=666013;
const int q=100000007;
inline int prod(int u,int v)
{
    u=1LL*u*v%q;
    return u;
}
inline int suma(int u,int v)
{
    u=(u+v)%q;
    return u;
}
string a,b;
int r=1,ha,hb,nr;
vector<int>ap;
int main()
{
    fin>>a>>b;
    int n=a.size(),m=b.size();
    for(int i=0; i<n-1; i++)
    {
        r=prod(r,p);

    }
    r=(q-r)%q;

    for(int i=0; i<n; i++)
    {
        ha=suma(prod(ha,p),a[i]);
        hb=suma(prod(hb,p),b[i]);
    }

    if(ha==hb)
    {
        nr++;
        ap.push_back(0);
    }

    for(int dr=n; dr<m; dr++)
    {
        hb=suma(hb,prod(b[dr-n],r));
        hb=prod(hb,p);
        hb=suma(hb,b[dr]);

        if(ha==hb)
        {
            nr++;
            if(nr<=1000)
            {
                ap.push_back(dr-n+1);
            }
        }
    }
    fout<<nr<<'\n';
    for(auto it: ap)
    {
        fout<<it<<' ';
    }
    return 0;
}