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