#include <bits/stdc++.h>

using namespace std;
ifstream f("strmatch.in");
ofstream g("strmatch.out");
string s,s2,s3;
int n,n2,k,i,urm[4000005],nr;
vector <int> aparitii;
int main()
{
    f>>s;
    f>>s2;
    n = s.size();
    n2 = s2.size();
    s3 = s+ '#'+s2;
    urm[0]=0;
    k=0;
    for (i=1;i<s3.size();i++)
    {
        while (k&&s3[i]!=s3[k])
        {
            k = urm[k-1];
        }
        if (s3[i]==s3[k])
        {
            k++;
        }
        urm[i] = k;
        if (k==n)
        {
            nr++;
            if (nr<=1000)
            {
                aparitii.push_back(i - 2*n);
            }
        }
    }
    g<<nr<<'\n';
    for (i=0;i<aparitii.size();i++)
    {
        g<<aparitii[i]<<" ";
    }
    return 0;
}