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.

Example Input: Sentence: 'a baseball player holding a glove in one hand and ball in the other'. How many words start with the letter 'a' in the sentence.
Example Output: 3

Example Input: Sentence: 'a beautiful young lady eating a candy apple on an amusement park ride'. How many words start with the letter 'a' in the sentence.
Example Output: 5

Example Input: Sentence: 'a street with a street light hanging over it'. How many words start with the letter 'a' in the sentence.
Example Output:
2