#include <fstream>
#include <vector>

using namespace std;

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

unsigned int p[2000009];

vector < size_t > v;

void f(string & s) {
    s = '!' + s;
    unsigned int k = 0;
    for(size_t i = 2; i < s.size(); ++i) {
        while (k && s[k + 1] != s[i]) {
            k = p[k];
        }
        if (s[k + 1] == s[i]) {
            p[i] = ++k;
        }
        else {
            k = 0;
        }
    }
}

string a, b;

int main() {
    cin >> a >> b;
    a = a + '!' + b;
    f(a);
    for (size_t i = a.size() - b.size() + 1; i < a.size(); ++i) {
        if (p[i] == a.size() - b.size() - 2) {
            v.push_back(i - a.size() + b.size() - 2);
        }
    }
    cout << v.size() << '\n';
    for (auto i : v) {
        cout << i << ' ';
    }
}