#include <iostream>
#include <fstream>
#include <algorithm>
#include <vector>
#include <cmath>
#include <utility>
#define ll long long

using namespace std;

const int MOD = 1e9;
const int BASE = 997;

int main() {

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

    string a, b;
    in >> a >> b;
    a = " " + a;
    b = " " + b;
    int n = a.size() - 1, m = b.size() - 1, needle_hash = 0;
    for(int i = 1; i <= n; i ++)
        needle_hash = (1LL * needle_hash * BASE + 1LL * (a[i] - '0')) % MOD;

    vector<int> p(m + 1, 1);
    for(int i = 1; i <= m; i ++)
        p[i] = (1LL * BASE * p[i - 1]) % MOD;

    vector<int> hs(m + 1, 0);
    int cnt = 0;
    vector<int> ans;
    for(int i = 1; i <= m; i ++) {
        hs[i] = (1LL * hs[i - 1] * BASE + 1LL * (b[i] - '0')) % MOD;
        if(i < n)
            continue;
        int pretender = (MOD + hs[i] - ((1LL * hs[i - n] * p[n]) % MOD)) % MOD;
        if(pretender == needle_hash) {
            cnt ++;
            if(ans.size() < 1000)
                ans.push_back(i - n);
        }
    }
    out << cnt << "\n";
    for(auto it : ans)
        out << it << " ";

    return 0;
}