#include <bits/stdc++.h>

using namespace std;
const int N = 2e6 + 5;
int pi[N], n, m;
void kmp(string &s) {
    int k = 0;
    n = s.length();
    for(int i = 1; i < n; i++) {
        while(k > 0 && s[i] != s[k]) {
            k = pi[k - 1];
        }
        if(s[i] == s[k])
            k++;
        pi[i] = k;
    }
}
int z[2 * N];
void Z(string &s) {
    int l = 0, r = 0;
    n = s.length();
    for(int i = 1; i < n; i++) {
        z[i] = 0;
        if(i < r) {
            z[i] = min(z[i - l], r - i);
        }
        while(i + z[i] < n && s[i + z[i]] == s[z[i]]) {
            z[i]++;
        }
        if(i + z[i] > r) {
            l = i;
            r = i + z[i];
        }
    }
}
// #define HOME

int main() {
#ifndef HOME
    ifstream cin("strmatch.in");
    ofstream cout("strmatch.out");
#endif
    string s, t;
    cin >> s >> t;
    int n = s.length();
    s += "#" + t;
    Z(s);
    vector <int> ans;
    for(int i = n + 1; i < s.length(); i++) {
        if(z[i] == n) {
            ans.push_back(i - n - 1);
        }
    }
    cout << ans.size() << "\n";
    for(int i = 0; i < min((int)ans.size(), 1000); i++)
        cout << ans[i] << " ";
    return 0;
}