public static void main(String[] args) {
for(int j=0,i=1990; i<=2014;i++){
if(i%4==0&&i%100!=0){
j=j+1;
System.out.print(i+" ");
if(j==2){ j=0;System.out.println();}
}
if(i%400==0){
j=j+1;
System.out.print(i+" ");
if(j==2){ j=0;System.out.println();}
}
}
}