In this task, you need to count the number of words in a sentence that start with the given letter. Answer with numbers and not words.

Input: Consider Input: Sentence: 'a picture of a mirror on a bike'. How many words start with the letter 'o' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a scooter with a bag on it parked next to a pasture with two cows in it'. How many words start with the letter 'i' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'several birds sit on the back of an elephant'. How many words start with the letter 's' in the sentence.


Output: 2