#include <iostream>
#include <iomanip>
using namespace std;
bool runnian(int n){
	int i=0;
	if(n%4==0&&n%100!=0) i=1;
	if(n%400==0) i=1;
	return (i==1);
}
int main() {
	int a,b,js;
	cin>>a>>b;
	for(int i=a;i<=b;i++){
		if(runnian(i)){
			js++;
			cout<<i<<" ";  
		}		
	}
	cout<<js;
	return 0;	
}