tri_area=int(input("Put the triangle's base size: "))
for col in range(tri_area):
    for row in range(tri_area-col):
        print("* ",end='')
    print()
for col in range(tri_area):
    for row in range(col+1):
        print("* ",end='')
    print()
for row in range(tri_area):
    print(' ' * (tri_area * 2 - 2 * row), end='')
    for col in range(row + 1):
        print('* ', end='')
    print()
for row in range(tri_area):
    print(' ' * (2 + 2 * row), end='')
    for col in range(tri_area - row):
        print('* ', end='')
    print()

'''
>>>
=============== RESTART: C:/Users/user/Desktop/cs10/so_matt.py ===============
Put the triangle's base size: 4
* * * *
* * *
* *
*
*
* *
* * *
* * * *
        *
      * *
    * * *
  * * * *
  * * * *
    * * *
      * *
        *
>>>
'''