#include <cstdio>
#include <cstring>

using namespace std;

char a[2000005], b[2000005];
int p[2000005], sol[1001], m, n, q, total;

void buildPrefix()
{
    int i = 2;
    q = 0;
    for(p[1] = 0; i <= m; ++i)
    {
        while(q && a[q + 1] != a[i]) q = p[q];
        if(a[q + 1] == a[i]) ++q;
        p[i] = q;
    }
}

int main()
{
    freopen("strmatch.in", "r", stdin);
    freopen("strmatch.out", "w", stdout);
    scanf("%s\n%s", a + 1, b + 1);
    fclose(stdin);
    m = strlen(a + 1); n = strlen(b + 1);
    if(m > n)
    {
        printf("0");
        return 0;
    }
    buildPrefix();
    q = 0;
    for(int i = 1; i <= n; ++i)
    {
        while(q && a[q + 1] != b[i]) q = p[q];
        if(a[q + 1] == b[i]) ++q;
        if(q == m)
        {
            q = p[m];
            if(total < 1000) sol[total] = i - m;
            total++;
        }
    }
    printf("%d\n", total);
    for(int i = 0; i < (total < 1000 ? total : 1000); ++i) printf("%d ", sol[i]);
    fclose(stdout);
    return 0;
}