#include <iostream>
#include <string>
#define mx 1<<21
using namespace std;
long i,h,n,m,p;
long pi[mx+4];
long v[1024];
char s1[mx+4],s2[mx+4];

void prefix()
{
        pi[0]=0;
        p=0;
        for (i=1; i<=n; i++)
        {
                while (p>0 && s1[i]!=s1[p+1])
                        p=pi[p];
                if (s1[i]==s1[p+1])
                        p++;
                pi[i]=p;
        }
}

void kmp()
{
        n=strlen(s1)-1;
        m=strlen(s2)-1;
        prefix();
        p=0;
        h=0;
        for (i=0; i<=m; i++)
        {
                while (p>0 && s2[i]!=s1[p+1])
                        p=pi[p];
                if (s2[i]==s1[p+1])
                        p++;
                if (p==m)
                {
                        h++;
                        p=pi[p];
                        if (h<=1000)
                                v[h]=i-m;
                }
        }
}

int main(void)
{
        freopen("strmatch.in","r",stdin);
        freopen("strmatch.out","w",stdout);
        fgets(s1+1,mx,stdin);
        fgets(s2+1,mx,stdin);
        kmp();
        printf("%ld\n",h);
        if (h>1000)
                h=1000;
        for (i=1; i<=h; i++)
                printf("%ld",v[i]);
        fclose(stdin);
        fclose(stdout);
        return 0;
}