#include <bits/stdc++.h>

#define MAXN 2000001
#define P 73
#define MOD1 100007
#define MOD2 100021

using namespace std;

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

string A,B;
int NA, NB;
int hashA1, hashA2, P1, P2;
bitset<MAXN> match;

int main()
{
    fin>>A>>B;
    NA = A.size();
    NB = B.size();

    P1 = P2 = 1;
    hashA1 = hashA2 = 0;
    for (int i = 0; i < NA; i++)
    {
        hashA1 = (hashA1 * P + A[i]) % MOD1;
        hashA2 = (hashA2 * P + A[i]) % MOD2;

        if (i != 0)
            P1 = (P1 * P) % MOD1,
            P2 = (P2 * P) % MOD2;
    }

    if (NA > NB)
    {
        fout<<0<<'\n';
        return 0;
    }

    int hash1 = 0, hash2 = 0;
    for (int i = 0; i < NA; i++)
        hash1 = (hash1 * P + B[i]) % MOD1,
        hash2 = (hash2 * P + B[i]) % MOD2;

    int aparitii = 0;
    if (hash1 == hashA1 && hash2 == hashA2)
        match[0] = 1, aparitii++;

    for (int i = NA; i < NB; i++)
    {
        hash1 = ((hash1 - (B[i - NA] * P1) % MOD1 + MOD1) * P + B[i]) % MOD1;
        hash2 = ((hash2 - (B[i - NA] * P2) % MOD2 + MOD2) * P + B[i]) % MOD2;

        if (hash1 == hashA1 && hash2 == hashA2)
            match[ i - NA + 1 ] = 1, aparitii++;
    }
    fout<<aparitii<<'\n';

    aparitii = 0;
    for (int i = 0; i < NB && aparitii < 1000; i++)
        if (match[i])
            aparitii++,
            fout<<i<<' ';
    fout<<'\n';
    return 0;
}