#include <fstream>
#include <string>
#include <vector>

using namespace std;
ifstream cin("strmatch.in");
ofstream cout("strmatch.out");

string a, b, sir;
int kmp[4000002];

int main()
{
    vector<int> rez;
    cin>>a>>b;
    sir = "&";
    sir += a;
    sir += "$";
    sir += b;
    int n = sir.size(), nrsecv = 0;
    int la = a.size();
    kmp[1] = 0;

    for(int i = 2; i < n; ++i)
    {
        int k = kmp[i - 1];
        while(k != 0 && sir[i] != sir[k + 1])
        {
            k = kmp[k];
        }
        if(sir[i] == sir[k+1])
        {
            kmp[i] = k + 1;
        }
        if(kmp[i] == la)
        {
            ++nrsecv;
            if(nrsecv <= 1000)
            {
                rez.push_back(i);
            }
        }
    }
    cout<<nrsecv<<"\n";
    for(auto i : rez)
    {
        cout<<i - 2 * la - 1<<" ";
    }

    return 0;
}