import sys
n = 10
space = n-1
for i in range(n):
  for j in range(space+1):
    sys.stdout.write(" ")
  for k in range(i):
    sys.stdout.write("* ")
  space -= 1
  sys.stdout.write("\n")
space = 0
for i in range(n,0,-1):
  for j in range(space):
    sys.stdout.write(" ")
  for k in range(i):
    sys.stdout.write("* ")
  space += 1
  sys.stdout.write("\n")