from string import ascii_lowercase

def print_rangoli(size):
    alphas = list(reversed(ascii_lowercase[:size]))
    
    for i in range(1, size+1):
        print("-".join(alphas[0:i] + \
        list(reversed(alphas[0:i]))[1:]).center((size*2 -1)*2 - 1, "-"))
    for i in range(size-1, 0, -1 ):
        print("-".join(alphas[0:i] + \
        list(reversed(alphas[0:i]))[1:]).center((size*2 -1)*2 - 1, "-"))