#include<bits/stdc++.h>
using namespace std;
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");
char a[2000010],b[2000010];
int p=31,mod=145376,stra,strb;
void citire()
{
    fin>>a>>b;
    stra=strlen(a);
    strb=strlen(b);
}
void solve()
{
    int hasha=0,hashb=0,c=1;
    vector<int>sol;
    for(int i=0;i<stra;i++)
    {
        hasha=hasha*p+a[i];
        hasha=hasha%mod;
        c=c*p%mod;
    }
    for(int i=0;i<stra;i++)
    {
        hashb=hashb*p+b[i];
        hashb=hashb%mod;
    }
    if(hasha==hashb)
    {
        sol.push_back(0);
    }
    for(int i=stra;i<strb;i++)
    {
        hashb=(mod+(hashb*p)%mod-(b[i-stra]*c)%mod+b[i])%mod;
        if(hasha==hashb)
        {
            sol.push_back(i-stra+1);
        }
    }
    fout<<sol.size()<<'\n';
    for(int i=0;i<min(int(sol.size()),1000);i++)
    {
        fout<<sol[i]<<' ';
    }
}
int main()
{
    citire();
    if(stra>strb)
    {
        fout<<0;
        return 0;
    }
    solve();
    return 0;
}