#include <stdio.h>
#include <string.h>
 
#define MAXN 2000001
 
#define P 73
#define MOD1 100007
#define MOD2 100021
 
char A[MAXN], B[MAXN];
int NA, NB;
 
int hashA1, hashA2, P1, P2;
 
char match[MAXN];
 
int main()
{
    freopen("strmatch.in", "rt", stdin);
    freopen("strmatch.out", "wt", stdout);
     
    scanf("%s %s", A, B);
    NA = strlen(A);
    NB = strlen(B);
 
    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)
    {
        printf("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 Nr = 0;
    if (hash1 == hashA1 && hash2 == hashA2)
        match[0] = 1, Nr++;
 
    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, Nr++;
    }
    printf("%d\n", Nr);
 
    Nr = 0;
    for (int i = 0; i < NB && Nr < 1000; i++)
        if (match[i])
            Nr++,
            printf("%d ", i);
    printf("\n");
     
    return 0;
}