#include <iostream>
#include <fstream>
#include <algorithm>
#include <cstring>
#include <vector>

using namespace std;

ifstream fin ("strmatch.in");
ofstream fout ("strmatch.out");

const int NMAX=2e6+5;

int prefix[2*NMAX];
vector<int>v;
string s;
string b;

int main()
{
    int n,i,j,kon=0,m;
    fin>>s;
    s=s+'#';
    m=s.length()-1;
    fin>>b;
    s=s+b;
    n=s.length();
    for(i=1;i<n;i++)
    {
        while(kon>0 && s[kon]!=s[i])
            kon=prefix[kon-1];
        if(s[kon]==s[i])
            kon++;
        prefix[i]=kon;
        if(kon==m)
            v.push_back(i-m-m);
    }
    fout<<v.size()<<"\n";
    for(auto i:v)
        fout<<i<<" ";
}