#include<fstream>
#include<iostream>
#include<vector>
#define DN 2000005
using namespace std;
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");
string a,b;
int pr[DN],k,nr;
vector<int>r;
int main()
{
    fin>>a>>b;
    k=-1;
    pr[0]=-1;
    for(int i=1;i<a.size();i++)
    {
        while(k!=-1&&a[k+1]!=a[i])
            k=pr[k];
        if(a[k+1]==a[i])
            k++;
        pr[i]=k;
    }
    k=-1;
    for(int i=0;i<b.size();i++)
    {
        while(k!=-1&&a[k+1]!=b[i])
            k=pr[k];
        if(a[k+1]==b[i])
            k++;
        if(k==a.size()-1)
        {
            nr++;
            r.push_back(i-k);
        }
    }
    fout<<nr<<'\n';
    for(int i=0;i<min(nr,1000);i++)
        fout<<r[i]<<' ';
}