#include <iostream>
#include <fstream>
#include <cstring>
#include <vector>
using namespace std;
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");
#define MAX 2000002
#define cout fout
int k, i, n, pi[MAX];
char a[MAX], b[MAX];

vector<int> v;

void failure_func()
{
    int k = 0;
    for(i = 2 ; i <= n ; i++)
    {
        k = pi[i - 1];
        while(k && a[k + 1] != a[i])
            k = pi[k];
        if(a[k + 1] == a[i])
        {
            k++;
        }
        pi[i] = k;
    }
}

int main()
{
    fin >> (a+1) >> (b+1);
    n = strlen(a + 1);
    failure_func();
    k = 0;
    for(i = 1 ; b[i] ; i++)
    {
        while(k && a[k + 1] != b[i])
        {
            k = pi[k];
        }
        if(a[k + 1] == b[i])
            k++;
       // cout << k << " ";
        if(k == n)
        {
            v.push_back(i - n);
            k = pi[k];
        }
    }
    cout << v.size() << "\n";
    for(i = 0 ; i < v.size() && i < 1000; i++)
    {
        cout << v[i] << " ";
    }
    return 0;
}