class hollowPyramid {
public static void main(String[] args) {
// size of the pyramid
int size = 5;
for (int i = 0; i < size; i++) {
// print spaces
for (int j = 0; j < size - i - 1; j++) {
System.out.print(" ");
}
// print stars
for (int k = 0; k < 2 * i + 1; k++) {
if (i == 0 || i == size - 1) {
System.out.print("*");
}
else {
if (k == 0 || k == 2 * i) {
System.out.print("*");
}
else {
System.out.print(" ");
}
}
}
System.out.println();
}
}
}