#include <bits/stdc++.h>

using namespace std;

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

vector<int> zFunction(string s){

    int n = s.length();
    vector<int> z(n);

    int left = 0, right = 0;
    
    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;
    int sz = pattern.size();

    pattern += '#';
    pattern += s;

    vector<int> z = zFunction(pattern);
    vector<int> ans;

    for(int i = 0; i < z.size(); ++i){
        if(z[i] == sz) ans.push_back(i - sz - 1);
    }

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

}

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