#include<cstdio>
#include<vector>
using namespace std;
char A[2000001],B[2000001];
int i,pre,k[2000001],p,cnt;
vector <int> v;
int main()
{
    freopen("strmatch.in","r",stdin);
    freopen("strmatch.out","w",stdout);
    gets(A);
    gets(B);
    int n=1;
    for(i=1;A[i]!=0;i++)
    {
        n++;
        pre=k[i-1];
        while(A[pre]!=A[i]&&pre>0)
        {
            pre=k[pre-1];
        }
        if(A[i]!=A[pre])
            k[i]=0;
        else
            k[i]=pre+1;
        //printf("%d->%d\n",i,k[i]);
    }
    p=0;
    for(i=0;B[i]!=0;i++)
    {
        while(A[p]!=B[i]&&p>0)
        {
            p=k[p-1];
        }
        if(A[p]==B[i])
        {
            p++;
            if(p==n)
            {
                cnt++;
                if(v.size()<1000)
                    v.push_back(i-n+1);
                p=k[p-1];
            }
        }
    }
    printf("%d\n",cnt);
    for(i=0;i<v.size();i++)
        printf("%d ",v[i]);
    return 0;
}