Aramic script

题目描述

In Aramic language words can only represent objects. Words in Aramic have special properties: - A word is a root if it does not contain the same letter more than once. - A root and all its permutations represent the same object. - The root $ x $ of a word $ y $ is the word that contains all letters that appear in $ y $ in a way that each letter appears once. For example, the root of "aaaa", "aa", "aaa" is "a", the root of "aabb", "bab", "baabb", "ab" is "ab". - Any word in Aramic represents the same object as its root. You have an ancient script in Aramic. What is the number of different objects mentioned in the script?

输入输出格式

输入格式

The first line contains one integer $ n $ ( $ 1 \leq n \leq 10^3 $ ) — the number of words in the script. The second line contains $ n $ words $ s_1, s_2, \ldots, s_n $ — the script itself. The length of each string does not exceed $ 10^3 $ . It is guaranteed that all characters of the strings are small latin letters.

输出格式

Output one integer — the number of different objects mentioned in the given ancient Aramic script.

输入输出样例

输入样例 #1

5
a aa aaa ab abb

输出样例 #1

2

输入样例 #2

3
amer arem mrea

输出样例 #2

1

说明

In the first test, there are two objects mentioned. The roots that represent them are "a","ab". In the second test, there is only one object, its root is "amer", the other strings are just permutations of "amer".