#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define ld long double
#define pb push_back
#define mp make_pair
using namespace std;
 
constexpr const int NMAX=1e6+8;
constexpr const ll mod=1e9+7;
 
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");

string a,b;
int pi[4*NMAX];

void solve()
{
    fin >> a >> b;  
    int n=int(a.size());

    a=a+"#"+b;
    for(int i=1; i<(int)a.size(); i++)
    {
        int j=pi[i-1];
        while(j>0 && a[i]!=a[j])
            j=pi[j-1];

        if(a[i]==a[j])
            j++;
        pi[i]=j;
    }

    vector<int> occ;
    for(int i=n+1; i<(int)a.size(); i++)
    {
        if(pi[i]==n)
            occ.pb(i-2*n);
    }

    fout << (int)occ.size() << "\n";
    for(int i=0; i<min(1000,(int)occ.size()); i++)
        fout << occ[i] << " ";
}   

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
 
    int tests=1;
    // cin >> tests;
    for(int i=1; i<=tests; i++)
        solve();
    
    return 0;
}