#include <bits/stdc++.h>

using namespace std;

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

string a,b,s;
vector <int> ans;

int z[4000005];

int main()
{
    fin>>a>>b;
    s=a+"#"+b;
    int l=0, r=0;
    for (int i=1; i<s.size(); ++i)
    {
        if (i<=r) {
            z[i] = min(z[i-l],r-i+1);
        }
        while (i+z[i]<=s.size() && s[z[i]]==s[i+z[i]]) {
            z[i]++;
        }
        if (i+z[i]-1>r) {
            l=i;
            r=i+z[i]-1;
        }
    }
    for(int i=a.size()+1; i<s.size(); i++)
    {
        if(z[i]>=a.size())
            ans.push_back(i-a.size()-1);
    }
    fout<<ans.size()<<"\n";
    for(int i=0; i<min((int)ans.size(),1000); i++)
        fout<<ans[i]<<" ";
    fout<<"\n";
    return 0;
}