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?
On the first line, the number . On the next lines, a single string of lowercase letters.
A single line containing the number of strings that can be typed exclusively using a single row of the QWERTY keyboard.
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