#include <bits/stdc++.h>

using namespace std;
const string TASK("strmatch");
ifstream fin(TASK + ".in");
ofstream fout(TASK + ".out");
#define cin fin
#define cout fout

const int N = 2e6 + 9;

string s, b;
int z[N];

int main()
{
    cin >> s >> b;
    int tar = s.size();
    s.push_back('#');
    s += b;

    int l = 0, r = 0, n = s.size();
    for(int i = 0; i < n; ++i)
    {
        if(i < r)z[i] = z[i - l];
        while(i + z[i] < n && s[i + z[i]] == s[z[i]])++ z[i];
        if(z[i] > r)
        {
            l = i;
            r = r + z[i];
        }
    }

    vector<int> ans;
    for(int i = 0; i < n; ++i)
        if(z[i] == tar && ans.size() < 1000)
            ans.push_back(i - tar - 1);

    cout << ans.size() << '\n';
    for(auto i : ans)cout << i << ' ';
    return 0;
}