import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

public class Main {

public static void main(String[] args) throws IOException {

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

int N = Integer.parseInt(br.readLine());

int cnt = 0;

OUTER:

for(int i = 0; i < N; i++) {

boolean[] check = new boolean[26];

String target = br.readLine();

int prev = 0;

for(int j = 0; j < target.length(); j++) {

if(prev != target.charAt(j)) {

if(check[target.charAt(j) - 'a'] == false) {

check[target.charAt(j) - 'a'] = true;

prev = target.charAt(j);

}

else {continue OUTER;}

}

}

cnt++;

}

System.out.println(cnt);

}

}