#include <stdio.h>
int main()
{
char word[101];
int N;
scanf_s("%d", &N);
int count = N;
for (int i = 0; i < N; i++)
{
char first = '0';
int Alpha[26] = { 0, };
scanf_s("%s", word, sizeof(word));
for (int j = 0; word[j] != '\0'; j++)
{
if (first != word[j])
{
first = word[j];
Alpha[word[j] - 'a']++;
}
if (Alpha[word[j] - 'a'] == 2)
{
count -= 1;
break;
}
}
}
printf("%d", count);
return 0;
}