#include <bits/stdc++.h>
using namespace std;

const string FILENAME = "strmatch";
ifstream fin(FILENAME + ".in");
ofstream fout(FILENAME + ".out");


string pat, txt;
vector<int> ans;
int lps[2000001];

void computeLps(string pat, int m)
{
    int len = 0;
    lps[0] = 0;
    int i = 1;
    while(i < m)
    {
        if(pat[i] == pat[len])
        {
            len++;
            lps[i] = len;
            i++;
        }
        else 
        {
            if(len != 0)
            len = lps[len - 1];
            else 
            {
                lps[i] = 0;
                i++;
            }
        }
        
    }
}

void KMPSearch(string pat, string txt)
{
    int n = txt.size(), m = pat.size();
    computeLps(pat, m);
    int i = 0, j = 0;
    while(i < n)
    {
        if(pat[j] == txt[i])
        {
            i++;
            j++;
        }
        if(j == m)
        {
            ans.push_back(i - j);
            j = lps[j - 1];
        }
        else if(i < n && pat[j] != txt[i])
        {
            if(j != 0) j = lps[j - 1];
            else i++;
        }
    }
}

int main()
{
    fin >> pat >> txt;
    KMPSearch(pat, txt);
    fout << ans.size() << "\n";
    for(auto i : ans)
        fout << i << " ";
    fin.close();
    fout.close();
    return 0;
}