#include<bits/stdc++.h>
using namespace std;
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");
vector<int>pf(string s)
{
    vector<int>pi;
    pi.push_back(0);
    for(int i=1;i<s.size();i++)
    {
        int j=pi[i-1];
        while(j>0&&s[j]!=s[i])
            j=pi[j-1];
        if(s[i]==s[j])
            j++;
        pi.push_back(j);
    }
    return pi;
}
vector<int>v,rez;
int main()
{
    string a,b;
    int nr=0;
    fin>>a>>b;
    string s=a+'#'+b;
    vector<int>v=pf(s);
    int l=a.size();
    for(int i=l;i<v.size();i++)
        if(v[i]==l)
        {
             nr++;
             rez.push_back(i-l-l);
        }
    fout<<rez.size()<<"\n";
    for(int i=0;i<min((int)rez.size(),1000);i++)
        fout<<rez[i]<<" ";
}