#include <iostream>
#include <fstream>
#include <cstring>
#include <vector>
using namespace std;
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");
#define MAX 2000010

vector<int> rez;
char a[MAX], b[MAX];
int pi[MAX];
int main()
{
    int m;
    int n, i, ptr;
    fin >> (a + 1);
    fin >> (b + 1);
    n = strlen(a + 1);
    m = strlen(b + 1);
    ptr = 0;
    for(i = 1 ; i <= n ; i++)
    {
        while(ptr && a[i] != a[ptr + 1])
            ptr = pi[ptr];
        if(a[i] == a[ptr + 1] && i != 1)
            ptr ++;
        pi[i] = ptr;
    }
    ptr = 0;
    for(i = 1 ; i <= m ; i++)
    {
        while(ptr && b[i] != a[ptr + 1])
            ptr = pi[ptr];
        if(b[i] == a[ptr + 1])
            ptr++;
        if(ptr == n)
        {
            rez.push_back(i - n);
            ptr = pi[ptr];
        }
    }
    fout << rez.size() << "\n";
    m = rez.size();
    m = min(m, 1000);
    for(i = 0 ; i < m ; i++)
    {
        fout << rez[i] << " ";
    }
    fout << "\n";

}