[백준] 1316

#include <iostream>
#include <string>
#include <vector>
#include <deque>
#include <algorithm>

using namespace std;

bool alpha[26] = { false, };

int main()
{
	int T;
	cin >> T;

	int cnt = 0;
	while (T--) {
		for (int i = 0; i < 26; i++) alpha[i] = false;
		string str;
		cin >> str;
		bool group_word = true;
		for (int i = 0; i< int(str.length());i++) {
			int idx = int(str[i] - 'a');
			if (alpha[idx] == false)
			{
				alpha[idx] = true;
				while (str[i + 1] == str[i]) i++;
			}
			else group_word = false;
		}
		if (group_word) cnt++;

	}
	cout << cnt;
	return 0;
}