public class Tri {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
int last = 5;
for (int i = 1, n = 1; i <= last; i++) {
int p = n;
while (p-- > 0)
System.out.print(Integer.toHexString(i));
n = i <= last / 2 ? n + 1 : n - 1;
System.out.println();
}
}
}