## VMSS Pre-Pre-Windsor P3 - SC2 Multitasking

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Points: 3
Time limit: 2.0s
Memory limit: 64M

Authors:
Problem type

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 words in his English essay , each one of them less than or equal to 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 . On the next 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
gone
3