height = 10
for row_level in range(height):
    string = ''
    for left_step in range(height - row_level):
        string += ' '
    string += '*'

    for right_step in range(row_level * 2):
        string += ' '
    print(string + '*')

else:
    string = ''
    for i in range(height * 2 + 2):
        string += '*'
    print(string)