#include<stdio.h>
int main ()
	{
	int a,b;
	scanf("%d %d",&a,&b);
	compo(a,b);
	}
int compo(int a,int b)
{
	int i;
	for(i=a;i<=b;i++)
	{
	if (i%2==0)
	printf(" %d",i);
	}
	return 0;
}