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 flat screen tv with an image of a baseball player holding a baseball bat'. How many words start with the letter 'a' in the sentence.
Example Output: 4

Example Input: Sentence: 'a cat is laying in a bowl with a receipt'. How many words start with the letter 'a' in the sentence.
Example Output: 3

Example Input: Sentence: 'a male pitcher is practicing throwing the ball'. How many words start with the letter 't' in the sentence.
Example Output:
2