Puzzle: Find the missing alphabet in the following series?

PUZZLE: Find the missing alphabet in the following series?

O, T , T, F, F ,S , S, E, ?

Solution & Explanation

These are basically the first alphabets of the digits 1, 2, 3, 4, 5, 6, 7, 8 when written in words.

Thus, the next will be 9-Nine-N. So the answer is N.