#include <stdio.h>
#include <math.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;
}