打印金字塔形状

def f():

 n=int(input(":"))
 for i in range(0,n+1):
   if i ==0:
       print(" "*(n)+"$")
   elif i==n:
       print("$"*(2*n-1))
   else:
       print(" "*(n-i)+"$"+((2*i)-1)*" " +"$")


if __name__ == '__main__':
   f()