#include <fstream>
#include <vector>
#include <cstring>
using namespace std;

ifstream in("strmatch.in");
ofstream out("strmatch.out");

const int N = 2e6;
char pattern[N+1],txt[N+1];
int lps[N+1]; /// longest prefix that is also sufix (in pattern)
vector <int> pos;

void calculateLPS(int m)
{
    int len = 0;
    lps[0] = 0;
    int i=1;
    while(i < m)
    {
        if(pattern[i]==pattern[len])
        {
            ++len;
            lps[i] = len;
            ++i;
        }
        else{
            if(len!=0){
                len = lps[len-1];
            }
            else
            {
                lps[i] = 0;
                ++i;
            }
        }
    }
}

void KmpSearch(char *pattern, char *txt){
    int n = strlen(txt);
    int m = strlen(pattern);
    calculateLPS(m);
    int i=0,j=0;
    while(i<n)
    {
        if(pattern[j] == txt[i])
        {
            ++i;
            ++j;
        }
        if(j==m)
        {
            pos.push_back(i-m);
            j = lps[j-1];
        }
        else if(i<n && pattern[j] != txt[i])
        {
            if(j!=0)
            {
                j = lps[j-1];
            }
            else{
                ++i;
            }
        }
    }
}

int main()
{
    in>>pattern>>txt;
    KmpSearch(pattern,txt);
    out<<pos.size()<<'\n';
    for(auto &i : pos)
        out<<i<<' ';
    return 0;
}