n= int(input())
l = int(input())

end_letter = ord('a') + l
for symbol1 in range (1, n):
    for symbol2 in range (1, n):
        for symbol3 in range (ord('a'), end_letter):
            for symbol4 in range(ord('a'), end_letter):
                for symbol5 in range (2, n+1):
                    if (symbol5 > symbol1) and (symbol5 > symbol2):
                        print(f'{symbol1}{symbol2}{chr(symbol3)}{chr(symbol4)}{symbol5}', end=' ')