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

#define ull unsigned long long

using namespace std;

struct Hash {
    vector<ull> hash;
    vector<ull> pow;

    void build_hash(string& s, ull radix) {
        hash.resize(s.size());
        pow.resize(s.size());

        pow[0] = 1;
        hash[0] = s[0] - 'a' + 1;
        for (int i = 1; i < s.size(); ++i) {
            pow[i] = pow[i - 1] * radix;
            hash[i] = hash[i - 1] * radix + (s[i] - 'a' + 1);
        }
    }

    ull get_hash(int l, int r) {
        if (l == 0) {
            return hash[r];
        }
        return hash[r] - hash[l - 1] * pow[r - l + 1];
    }
};

int main() {
    string s, substring;
    int n;
    set<int> positions;
    Hash h1, h2;

    cin >> s >> substring;
    n = substring.size() - 1;

    h1.build_hash(s, 29);
    h2.build_hash(substring, 29);

    for (int i = 0; i < s.size() - n; ++i) {
        if (h2.get_hash(0, n) == h1.get_hash(i, i + n)) {
            positions.insert(i);
        }
    }

    cout << positions.size() << '\n';
    for (auto & pos : positions) {
        cout << pos << ' ';
    }
    return 0;
}