#include <bits/stdc++.h>

using namespace std;
ifstream f("strmatch.in");
ofstream g("strmatch.out");
string s,s1,s2;
int urm[4000005],k,i,nr;
vector <int> sol;
int main()
{
    f>>s;
    f>>s1;
    s2=s+'#'+s1;
    urm[0]=0;
    k=0;
    for (i=1;i<s2.size();i++)
    {
        while (k&&s2[i]!=s2[k])
        {
            k=urm[k-1];
        }
        if (s2[i]==s2[k])
        {
            k++;
        }
        urm[i]=k;
        if (urm[i]==s.size())
        {
            nr++;
            if (nr<=1000)
            {
                sol.push_back(i-2*s.size());
            }
        }
    }
    g<<nr<<'\n';
    for (i=0;i<sol.size();i++)
    {
        g<<sol[i]<<" ";
    }
    return 0;
}