#include <fstream>
#include <vector>
#include <cstring>

using namespace std;

ifstream fin("strmatch.in");
ofstream fout("strmatch.out");

char x[2000001],y[2000001];

int pi[2000001];
int d[2000001];

vector<int> sol;

int main()
{

    fin.getline(x+1,2000000);
    fin.getline(y+1,2000000);

    int n = strlen(x+1);
    int m = strlen(y+1);
    int k = 0;
    pi[1] = 0;
    for(int i=2;i<=n;i++)
    {
        while(k && x[i] != x[k+1])
            k = pi[k];
        if(x[k+1] == x[i])
            ++k;
        pi[i] = k;
    }

    k = 0;

    for(int i=1;i<m;i++)
    {
        while(k && y[i] != x[k+1])
            k = pi[k];
        if(y[i] == x[k+1])
            ++k;
        d[i] = k;
        if(d[i] == n)
            sol.push_back(i-n);
    }

    fout<<sol.size()<<'\n';
    for(unsigned int i=0; i<sol.size() && i<1000;i++)
        fout<<sol[i]<<' ';

    fin.close();
    fout.close();
    return 0;
}