#include<fstream>
#include<string.h>
using namespace std;
ifstream fi("strmatch.in");
ofstream fo("strmatch.out");
char a[2000005],b[2000005];
int pi[2000005],l[1000000];
int main(){
	int n,m,c,k;
	fi>>a+1;
	fi>>b+1;
	n=strlen(a+1);
	m=strlen(b+1);
	k=0;
	pi[1]=0;
	for(int i=2;i<=n;i++){
		while(k!=0&&a[k+1]!=a[i])
		   k=pi[k];
		   if(a[k+1]==a[i]) k++;
		   pi[i]=k;
		   	}
	k=0;c=0;
	for(int i=1;i<=m;i++){
		while(k!=0&&b[i]!=a[k+1])
		       k=pi[k];
		       if(a[k+1]==b[i]) k++;
		      if(k==n){
		      	c++;
		      	if(c<=1000)
		      	 l[c]=i-n;
			  }
	}
	fo<<c<<endl;
		   	for(int i=1;i<=c;i++)
		   	   fo<<l[i]<<" ";
		   	   return 0;
	
	}