#include <iostream>
#include <fstream>
#include <string.h>
#include <algorithm>

using namespace std;


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

const int DIM =  2000005;

const long long cst1 = 100021;
const long long cst2 = 100007;
const int nr = 30;

char a[DIM];
char b[DIM];

long long power1[DIM];
long long power2[DIM];
int rez[DIM];

int main()
{
    /*functia hash se face cu puterile nr de litere posibile din vector in cazul acesta sunt nr de litere mici si mari din alfabet englez adica 52 */
    in >> a;
    in >> b;

    int  K = 0;
    power1[0] = 1;
    power2[0] = 1;
    int A = strlen(a);
    for(int i = 1;i <= A;i++)
    {
     power1[i] = (power1[i - 1] % cst1 * nr )% cst1;
     power2[i] = (power2[i - 1] % cst2 * nr )% cst2;
    }
    int B = strlen(b);
    if(A > B)
    {out << 0;
    return 0;
    }

    long long S1 = 0;
    long long S2 = 0;
    long long val1 = 0;
    long long val2 = 0;
    for(int i = 0;i < A;i++)
    {
        val1 = (val1 + (power1[A - i - 1] * a[i]) % cst1) % cst1;
        val2 = (val2 + (power2[A - i - 1] * a[i] % cst2)) % cst2;
        S1 = (S1 + (power1[A - i - 1] * b[i]) % cst1) % cst1;
        S2 = (S2 + (power2[A - i - 1] *b[i]) % cst2) % cst2;
    }
    if(S1 == val1 && S2 == val2)
    {K++;
    rez[K] = 0;
    }
    for(int i = 1; i <= B - A;i++)
    {
        S1 = (((S1 - power1[A - 1] * b[i-1]) % cst1 * nr )% cst1 + b[i + A - 1]) % cst1;
        S2 = (((S2 - power2[A - 1] * b[i-1]) % cst2 * nr )% cst2 + b[i + A - 1]) % cst2;
        if(S1 == val1 && S2 == val2)
        {
            K++;
            rez[K] = i;
        }
    }
    out << K<<"\n";
    /* normal K ,in cazul asta e restrictie de 1000 de afisari*/
    for(int i = 1; i <= min(1000,K); i++)
        out << rez[i] <<" ";
    return 0;
}