def print_rangoli(number):
    total_rows = []
    for i in range(1,(number+1)):
        row_length = i
        descending_part = [chr(96 + number - j) for j in range(row_length)]
        rows = descending_part + descending_part[-2::-1]
        total_rows.append("-".join(rows))
    max_width = len(total_rows[-1])
    for k in total_rows:
        print(k.center(max_width,"-"))
    for k in reversed(total_rows[:-1]):
        print(k.center(max_width,"-"))