#include <iostream>
#include <string>
#include <vector>

using namespace std;

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

int main()
{
    vector<int> rez;
    cin>>a>>b;

    sir = a;
    sir += "$";
    sir += b;
    int n = sir.size(), best = 0, nrsecv = 0;
    int la = a.size();
    Z[0] = 0;

    for(int i = 1; i < n; ++i)
    {
        int capatdr = Z[best];
        int j = i - best;
        if(i < capatdr)
            Z[i] = min(capatdr, Z[j]);

        while(i + Z[i] < n && sir[Z[i]] == sir[Z[i] + i])
        {
            ++Z[i];
        }
        if(i + Z[i] > capatdr)
            best = i;
        if(Z[i] == la)
        {
            ++nrsecv;
            rez.push_back(i);
        }
    }
    cout<<nrsecv<<"\n";
    for(auto i : rez)
    {
        cout<<i - la - 1<<" ";
    }

    return 0;
}