first_num = int(input())
second_num = int(input()) + 97


for i in range(1, first_num):
    for j in range(1, first_num):
            for k in range(97, second_num):
                for l in range(97, second_num):
                    if i >= j:
                        for z in range(i + 1, first_num + 1):
                            print(str(i) + str(j) + chr(k) + chr(l) + str(z), end= " ")
                    else:
                        for z in range(j + 1, first_num + 1):
                            print(str(i) + str(j) + chr(k) + chr(l) + str(z), end= " ")