#include <fstream>
#include <vector>

using namespace std;

ifstream in("strmatch.in");
ofstream out("strmatch.out");
string s1, s2;
int lps[2000005];

void build_lps()
{
    int i = 1;
    int j = 0;

    while(i < s1.size())
    {
        if(s1[i] == s1[j])
        {
            j++;
            lps[i] = j;
            i++;
        }
        else
        {
            if(j == 0)
            {
                i++;
            }
            else
            {
                j = lps[j - 1];
            }
        }
    }
}

int main()
{
    in>>s1>>s2;

    build_lps();

    vector<int> ans;

    int i = 0;
    int j = 0;
    while(i < s2.size())
    {
        if(s1[j] == s2[i])
        {
            i++;
            j++;

            if(j == s1.size())
            {
                ans.push_back(i - s1.size());
                j = lps[j - 1];
            }
        }
        else
        {
            if(j == 0)
            {
                i++;
            }
            else
            {
                j = lps[j - 1];
            }
        }
    }

    out<<ans.size()<<'\n';
    for(int i = 0; i<min((int)ans.size(), 1000); i++)
    {
        out<<ans[i]<<" ";
    }

    return 0;
}