样例已过

#include<bits/stdc++.h>
using namespace std;
int x,y,z;
int main()
{
	cin>>x>>y;
	for(int i=x;i<y;i++)
	{
		if(i%4==0&&i%100!=0)z++;
        else if(i%400==0)z++;
	}
	cout<<z<<"\n";
	for(int i=x;i<y;i++)
	{
		if(i%4==0&&i%100!=0)cout<<i<<" ";
		else if(i%400==0)cout<<i<<" ";
	}
	return 0;
}