def main():
    N = int(input())
    for i in range(N-1):
        tmp = 'a'
        for j in range(18):
            if (i >> j) & 1:
                tmp += 'b'
            else:
                tmp += 'a'
        tmp += 'a'
        print(tmp)

    print('an')


if __name__ == "__main__":
    main()