#include<cstdio>
#include<cstring>
using namespace std;
int urm[2000005],n,m,k,x,i,aux,q,v[2000005];
char t[2000005],p[2000005],s[2000005];

void citire()
{
	freopen("strmatch.in","r",stdin);
	freopen("strmatch.out","w",stdout);
	scanf("%s\n",&p);
	scanf("%s",&t);
	n=strlen(t);
	m=strlen(p);
}

void prefix(char *p)
{
	k=-1;
	urm[0]=0;
	for(x=1;x<m;x++){
		while(k>0 && p[k+1]!=p[x])k=urm[k];
		if(p[k+1]==p[x])k++;
		urm[x]=k;
	}
}

void kmp()
{
	x=-1;
	for(i=0;i<n;i++){
		while(x>0 && p[x+1]!=t[i])x=urm[x];
		if(p[x+1]==t[i])x++;
		if(x==m-1){
			q++;
			v[q]=i-m+1;
			x=urm[x];
		}
	}
}

void afisare()
{
	printf("%d\n",q);
	if(q<=1000)for(i=1;i<=q;i++)printf("%d ",v[i]);
	else for(i=1;i<=1000;i++)printf("%d ",v[i]);
}

int main()
{
	citire();
	prefix(p);
	kmp();
	afisare();
	return 0;
}