#include <bits/stdc++.h>

using namespace std;
ifstream f("strmatch.in");
ofstream g("strmatch.out");
string s,s2,s3;
int n,k,i,urm[4000005],sol[20005],nr;
int main()
{
    f>>s;
    f>>s2;
    n = s.size();
    s3 = s+'#'+s2;
    k = 0;
    vector <int> v;
    for (i=1;i<s3.size();i++)
    {
        while (k && s3[i]!=s3[k])
        {
            k = urm[k-1];
        }
        if (s3[i] == s3[k])
        {
            k++;
        }
        if (k==n)
        {
            if (nr<1000)
            {
                nr++;
                sol[nr]=i-2*n;
            }
        }
        urm[i] = k;
    }
    g<<nr<<'\n';
    for (i=1;i<=nr;i++)
    {
        g<<sol[i]<<" ";
    }
    return 0;
}