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 bathroom with a toilet with a blue seat'. How many words start with the letter 'b' in the sentence.
Example Output: 2

Example Input: Sentence: 'a cat standing on a suitcase and checking out peoples bags'. How many words start with the letter 's' in the sentence.
Example Output: 2

Example Input: Sentence: 'a large teddy bear sitting on a bench with two smaller teddy bears'. How many words start with the letter 't' in the sentence.
Example Output:
3