#include<stdio.h>

int is_leap_year(int y)

{

   if((y%4==0&&y%100!=0) || (y%400==0))

      return 1;

   else

      return 0;

}

int main()

{

int year=0;

for(year=1000;year<=2000;year++)

{

if(1==is_leap_year(year))

{

printf("%d ",year);

}

}

 return 0;

}