#include <cstdio>
#include <cstring>

#define NMAX 2000005


using namespace std;

char p[NMAX], t[NMAX];
int n, m, nr, a[NMAX];

struct Hash
{
    int n, m, power, hashh;

    void init(char *s, int len)
    {
        power=1;
        hashh=0;
        for(int i=len-1; i>=0; i--)
        {
            hashh=(hashh+1LL*power*s[i])%m;
            if(i)
                power=(power*n)%m;
        }
    }

    void roll(char toRemove, char toAdd)
    {
        hashh=(((hashh-1LL*toRemove*power+m)*n)%m+toAdd)%m;
    }

};

int main()
{
    freopen("strmatch.in", "r", stdin);
    freopen("strmatch.out", "w", stdout);
    scanf("%s\n%s", p, t);

    n=strlen(p);
    m=strlen(t);

    Hash pHash{3, 666013}, tHash{3, 666013};
    Hash hHash{5, 17777777}, oHash{5, 17777777};
    pHash.init(p, n);
    tHash.init(t, n);
    hHash.init(p, n);
    oHash.init(t, n);

    if(pHash.hashh == tHash.hashh && hHash.hashh == oHash.hashh)
    {
        a[++nr]=0;
    }
    for(int i=n; i<m; i++)
    {
        tHash.roll(t[i-n], t[i]);
        oHash.roll(t[i-n], t[i]);
        if(pHash.hashh == tHash.hashh && hHash.hashh == oHash.hashh)
        {
            a[++nr]=(i-n+1);
        }
    }
    printf("%d\n", nr);
    if(nr>1000)
        nr=1000;
    for(int i=1; i<=nr; i++)
    {
        printf("%d ", a[i]);
    }
    return 0;
}