#include<fstream>
#include<string>
#include<vector>
using namespace std;
const int N=2000003;
ifstream cin("strmatch.in");
ofstream cout("strmatch.out");

string s,p,t;
int n,i,j;
vector<int> pi(N),sol;

int main()
{
    cin>>p>>t;  s=p+'*'+t; n=s.length();
    for (i=1;i<n;i++){
        j=pi[i-1];
        while(j>0 && s[i]!=s[j])j=pi[j-1];
        pi[i]=(j+=(s[i]==s[j]));
    }
    for (i=0;i<t.size();i++)
        if (pi[i+p.size()+1]==p.size())
        sol.push_back(i-p.size()+1);
    cout<<sol.size()<<'\n';
    int r=sol.size(); if (r>1000)r=1000;
    for (i=0;i<r;i++)
        cout<<sol[i]<<' ';
    return 0;
}