#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
const int nmax = 2000005;
int n,m,i,q,pi[nmax],sol[nmax],cnt;
char a[nmax],b[nmax];
int main()
{
	freopen("strmatch.in","r",stdin);
	freopen("strmatch.out","w",stdout);
	scanf("%s",a+1); n=strlen(a+1);
	scanf("%s",b+1); m=strlen(b+1);
	for(i=2;i<=n;i++)
	{
	    while(q && a[q+1]!=a[i]) q=pi[q];
	    if(a[q+1]==a[i]) q++;
	    pi[i]=q;
	}
	for(q=0,i=1;i<=m;i++)
	{
	    while(q && a[q+1]!=b[i]) q=pi[q];
	    if(a[q+1]==b[i]) q++;
	    if(q==n && ++cnt<=1000) sol[cnt]=i-n;
	}
	printf("%d\n",cnt);
	for(i=1;i<=min(1000,cnt);i++) printf("%d ",sol[i]);
	return 0;
}