#include <bits/stdc++.h>

using namespace std;
ifstream f("strmatch.in");
ofstream g("strmatch.out");
const int Mod1 = 1e9+7;
const int Mod2 = 1e9+9;
const int p = 70;
int main()
{
    string a,b;
    getline(f,a);
    getline(f,b);
    long long hi1=a[0]-'0',hi2=a[0]-'0',pt1=1,pt2=1,h1=0,h2=0;
    for(int i=1; i<a.size(); i++)
    {
        hi1=(hi1*p+a[i]-'0')%Mod1;
        hi2=(hi2*p+a[i]-'0')%Mod2;
        pt1=(pt1*p)%Mod1;
        pt2=(pt2*p)%Mod2;
    }
    for(int i=0; i<a.size(); i++)
    {
        h1=(h1*p+b[i]-'0')%Mod1;
        h2=(h2*p+b[i]-'0')%Mod2;
    }
    vector <int> rez;
    if(h1==hi1 && h2==hi2)
    {
        rez.push_back(0);
    }
    for(int i=a.size(); i<b.size(); i++)
    {
        h1=h1-pt1*(b[i-a.size()]-'0');
        h2=h2-pt2*(b[i-a.size()]-'0');
        if(h1<0)
        {
            h1+=Mod1;
        }
        if(h2<0)
        {
            h2+=Mod2;
        }
        h1=(h1*p+b[i]-'0')%Mod1;
        h2=(h2*p+b[i]-'0')%Mod2;
        if(h1==hi1 && h2==hi2)
        {
            rez.push_back(i-a.size()+1);
        }
    }
    g<<rez.size()<<'\n';
    for(int i=0;i<rez.size() && i<1000;i++)
    {
        g<<rez[i]<<' ';
    }
    return 0;
}