def print_rangoli(size):
    n = size
    letter = 96 + n
    max_len = 4*n-3
    strings = []

    for i in range(n):
        s = []
        for j in range(letter, letter-i-1, -1):
            s.append(chr(j))
        for k in range(letter-i+1, letter+1):
            s.append(chr(k))
        strings.append("-".join(s))

    for string in strings:
        print(f"{string:-^{max_len}}")

    for string in range(len(strings)-2, -1,-1):
        print(f"{strings[string]:-^{max_len}}")