#include <bits/stdc++.h>

using namespace std;
int phi[4000002];
vector <int> sol;
int main()
{

    ifstream cin("strmatch.in");
    ofstream cout("strmatch.out");
    string a,b;
    int init;
    int cnt = 0;
    cin >> a >> b;
    init = a.size();
    a += "#";
    a += b;
    int n = a.size();
    for(int i = 1;i < n;i++){
        int j = phi[i - 1];
        while(a[j] != a[i] && j > 0){
            j = phi[j - 1];
        }
        if(a[j] == a[i])
            j++;
        phi[i] = j;
        if(phi[i] == init)
        sol.push_back(i - 2 * init);
    }
    cout << sol.size() << "\n";
    for(int i = 0;i < sol.size();i++)
        cout << sol[i] << " ";
    return 0;
}