#include <bits/stdc++.h>

using namespace std;

#define INFILE "strmatch.in"
#define OUTFILE "strmatch.out"

vector<int> zFunction(string s){
    int n = s.size();
    int left = 0, right = 0;
    vector<int> z(n);
    for(int i = 1; i < n; ++i){
        if(i < right) z[i] = min(right - i, z[i - left]);
        while(i + z[i] < n && s[z[i]] == s[i + z[i]]){
            ++z[i];
        }
        if(i + z[i] > right) left = i, right = i + z[i];
    }
    return z;
}

void solve(){

    string pattern, s; cin >> pattern >> s;
    string aux = pattern + s;

    vector<int> z = zFunction(aux);

    // for(int i = 0; i < pattern.size(); ++i) cout << pattern[i] << " ";
    // for(int i = 0; i < s.size(); ++i) cout << s[i] << " ";
    // cout << '\n';

    // for(int i = 0; i < z.size(); ++i){
    //     cout << z[i] << " ";
    // }
    // cout << '\n';

    vector<int> ans;
    for(int i = 0; i < z.size(); ++i){
        if(z[i] == pattern.size()) ans.push_back(i - pattern.size());
    }

    cout << ans.size() << '\n';

    for(int i = 0; i < min(ans.size(), (size_t)(1000)); ++i){
        cout << ans[i] << " ";
    }

}

int main(){
    ios_base::sync_with_stdio(false);
    freopen(INFILE, "r", stdin);
    freopen(OUTFILE, "w", stdout);
    cin.tie(0), cout.tie(0);
    solve();
    return 0;
}