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