Last night, Henning was playing Starcraft 2 while simultaneously attempting to finish his English essay. Because he is such a grandmaster at the game, he can in fact do such a thing - but he only has a single keyboard. Henning has to reserve two thirds of his keyboard to play Starcraft 2; given a list of $N$ words in his English essay $(1\le N\le 100000)$, each one of them less than or equal to $10$ letters long, how many of them can be typed exclusively using one row of his QWERTY keyboard?

Input Specification

On the first line, the number $N$. On the next $N$ lines, a single string of lowercase letters.

Output Specification

A single line containing the number of strings that can be typed exclusively using a single row of the QWERTY keyboard.

Sample Input

5
dad
alaska
quip
legendary
gone

Sample Output

3