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 100\,000)~ 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?
On the first line, the number ~N~. On the next ~N~ 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.
5 dad alaska quip legendary gone