#include<bits/stdc++.h>
using namespace std;
ifstream fin ("strmatch.in");
ofstream fout("strmatch.out");
int n,prefix[2000006];
char s[2000006],patern[2000006];
vector<int>sol;

int main()
{
    fin.getline(patern,sizeof patern);
    fin.getline(s,sizeof s);
    int n=strlen(patern),m=strlen(s),i,j=0;
    for (i=1;i<n;i++)
    {
        while (j!=0 && patern[j]!=patern[i])
            j=prefix[j-1];
        if (patern[j]!=patern[i])
            prefix[i]=0;
        else    {
                ++j;
                prefix[i]=j;
        }
    }
    j=0;
    for (i=0;i<m;i++)
    {
        while (j!=0 && patern[j]!=s[i])
            j=prefix[j-1];
        if (patern[j]==s[i])
            j++;
        if (j==n)
            {
                sol.push_back(i-n+1);
                j=prefix[j-1];
            }
    }
    int lg=sol.size();
    fout<<lg<<'\n';
    for (i=0;i<min(1000,lg);i++)
        fout<<sol[i]<<' ';
    return 0;
}