#include <bits/stdc++.h>

using namespace std;

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

char a[2000005],b[2000005],la,lb;
int n,sol[2000001];
const int M=100007;
const int M2=100021;

void citire()
{
    fin>>a;
    fin.get();
    fin>>b;
    la=strlen(a);
    lb=strlen(b);
}

void rabinkarp()
{
    int ha=0,hb=0,ha1=0,hb1=0;
    int p=31;
    int p1=1,p2=1;
    for(int i=0;i<la;i++){
        ha=(ha*p+(a[i]))%M;
        if(i!=0)
            p1=(p1*p)%M;
    }
    for(int i=0;i<la;i++){
        hb=(hb*p+(b[i]))%M;
    }
    if(la>lb)
    {
        fout<<0;
        return ;
    }
    if(ha==hb){
        sol[0]=1;
        n++;
    }
    for(int i=la;i<lb;i++)
    {
        hb=((hb-(b[i-la]*p1)%M+M)*p+b[i])%M;
        if(ha==hb)
            sol[i-la+1]=1,n++;
    }
    fout<<n<<"\n";
    n=0;
    for(int i=0;i<lb && n<1000;i++)
        if(sol[i]){
            fout<<i<<" ";
            n++;
        }
}

int main()
{
    citire();
    rabinkarp();
    return 0;
}