#include<stdio.h>
#include<string.h>
#include<vector>
#define nmax 2000003
using namespace std;
//vector <int> sol;
char a[nmax],b[nmax];
int p[nmax],sol[1000];
void kmp_prefix(char *a,int n){
	int k=-1;
	p[0]=-1;
	for(int i=1;i<n;i++){
		while(k>=0 && a[k+1]!=a[i])
			k=p[k+1];
		if(a[k+1]==a[i])
			k++;
		p[i]=k;
		
	}
}


int main(){
	freopen("strmatch.in","r",stdin);
	freopen("strmatch.out","w",stdout);
	scanf("%s",&a);
	scanf("%s",&b);
	int n=strlen(a);
	int m=strlen(b);
	kmp_prefix(a,n);
	int k=-1;
	unsigned int j=0,nr=0;
	for(int i=0;i<m;i++){
		if(m-i>n-k)
			i=m;
		while(k>=0 && a[k+1]!=b[i])
			k=p[k];
		if(a[k+1]==b[i])
			k++;
		if(k==n-1){
			nr++;
			if(nr<=1000)
			sol[nr-1]=i-n+1;
		}
	}
	printf("%d\n",nr);
	if(nr<1000)
	for(j=0;j<nr;j++)
		printf("%d ",sol[j]);
	else
		for(j=0;j<1000;j++)
		printf("%d ",sol[j]);
	return 0;
}