#include <iostream>
#include <fstream>
#include <vector>
#define int long long
using namespace std;
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");
int MOD1=1e9+7,MOD2=1e9+13;
int p1=31,p2=37;
vector <int> ans;
string s1,s2;
int n,v;
int32_t main()
{
    fin>>s1;
    int has1=0,pow1=1,has12=0,pow2=1;
    for (int i=0; i<s1.size(); i++)
    {
        has1=has1*p1+s1[i];
        has1%=MOD1;
        if(i) pow1*=p1%MOD1;

        has12=has12*p2+s1[i];
        has12%=MOD2;
        if(i) pow2*=p2%MOD2;
    }
    //cout<<pow1<<' '<<has1<<'\n';
    fin>>s2;
    int has2=0,has22=0;
    for (int i=0; i<s1.size(); i++)
    {
        has2=has2*p1+s2[i];
        has2%=MOD1;

        has22=has22*p2+s2[i];
        has22%=MOD2;
    }
    if (has1==has2 && has12==has22) ans.push_back(0);
    for (int i=s1.size(); i<s2.size(); i++)
    {
        has2=(p1*((has2+MOD1-(s2[i-s1.size()]*pow1%MOD1))%MOD1)+s2[i])%MOD1;
        has22=(p2*((has22+MOD2-(s2[i-s1.size()]*pow2%MOD2))%MOD2)+s2[i])%MOD2;
        if (has2==has1 && has22==has12) ans.push_back(i-s1.size()+1);
    }
    fout<<ans.size()<<'\n';
    for (int i=0; i<ans.size() && i<=1000; i++)
        fout<<ans[i]<<' ';
    return 0;
}