#include <bits/stdc++.h>
using namespace std;
ifstream in("strmatch.in");
ofstream out("strmatch.out");
const int lim=2e6+4;
vector<int> z(string s)
{
    int n=s.size();
    vector<int> z(n);
    int x=0,y=0;
    for(int i=1;i<n;++i)
    {
        z[i]=max(0,min(z[i-x],y-i+1));
        while(i+z[i]<n and s[z[i]]==s[i+z[i]])
        {
            x=i;
            y=i+z[i];
            ++z[i];
        }
    }
    return z;
}
vector<int> poz;
string a,b;
int main()
{
    in>>a>>b;
    b=a+'#'+b;
    vector<int> v=z(b);
    for(int i=a.size()+1;i<b.size();++i)
    if(v[i]==a.size())
        poz.push_back(i-a.size()-1);
    out<<poz.size()<<'\n';
    for(int i=0;i<min(1000,(int)poz.size());++i)
        out<<poz[i]<<' ';
    return 0;
}