def rangoli(sz):
    characters = list(map(chr,range(ord('a'),ord('z')+1)))
    design = []

    for i in range(sz):
        s = "-".join(characters[i:sz])
        design.append((s[::-1]+s[1:]).center(4*sz-3, "-"))
        
    print('\n'.join(design[:0:-1]+design))


def main():
    n = int(input("Enter size of the rangoli characters: "))
    rangoli(n)

main()

# Coded by Shreya Idate