#include <iostream>
#include <fstream>
#include <cstring>
#include <queue>
#define fs first
#define sc second
#define pii pair <int, int>
#define Nmax 2000005
#define MOD1 666013
#define MOD2 100007

using namespace std;

ifstream f("strmatch.in");
ofstream g("strmatch.out");

char a[Nmax], b[Nmax];
int pr[Nmax], ans;
vector <int> sol;

void prefix(char s[], int len)
{
    int j=0;
    for (int i = 2; i <= len; i++)
    {
        while (j!=0 && s[i]!=s[j+1]) j = pr[j];
        if (s[i] == s[j+1]) j++;
        pr[i]=j;
    }
}

int main()
{
    f >> (a+1) >> (b+1);
    int la=strlen(a+1), lb=strlen(b+1);

    prefix(a, la);

    int j=0;
    for (int i = 1; i <= lb; i++)
    {
        while (j!=0 && b[i]!=a[j+1]) j = pr[j];
        if (b[i] == a[j+1]) j++;
        if (j == la)
        {
            ans++;
            if (sol.size()<1000) sol.push_back(i-la);
        }
    }
    g << ans << '\n';
    for (auto i:sol) g << i << " ";


    return 0;
}