Christmas Tree Pattern

 

n=int(input());a=n

if n<=1:

    print('You cannot generate christmas tree')

elif n>20:

    print('Tree is no more')

else:

    for i in range(1,n+2):

        print("-"*(n-i+1),end='')

        for j in range(-i+1,i):

            print('*',end='')

        print()

    while n!=2:

        for i in range(1,n):

            print('-'*(a-i),end='')

            for j in range(-i-1,i):

                print('*',end='')

            print()

        n-=1

    for i in range(2):

        print('-'*(a),end='')

        for j in range(i,i+1):

            print('*',end='')

        print()