#include <bits/stdc++.h>
using namespace std;
ifstream in("strmatch.in");
ofstream out("strmatch.out");
vector<int> poz;
const int A=666013;
const int B=1e9+7;
string a,b;
int ca,cb;
int put=1;
int n,m;
int main()
{
    in>>a>>b;
    n=a.size();
    m=b.size();
    for(int i=0;i<n;++i)
        ca=(1LL*ca*A+(int)a[i])%B,
        put=(1LL*put*A)%B;
    for(int i=0;i<n;++i)
        cb=(1LL*cb*A+(int)b[i])%B;
    if(ca==cb) poz.push_back(0);
    for(int i=n;i<m;++i)
    {
        cb=(1LL*cb*A)%B;
        cb=(cb+B-(1LL*put*((int)b[i-n]))%B)%B;
        cb=(cb+(int)b[i])%B;
        if(ca==cb) poz.push_back(i-n+1);
    }
    out<<poz.size()<<'\n';
    for(int i=0;i<min(1000,(int)poz.size());++i)
        out<<poz[i]<<' ';
    return 0;
}