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: 'the man is wearing a suit and tie'. How many words start with the letter 't' in the sentence.
Example Output: 2

Example Input: Sentence: 'a person leans back while holding onto a flying object'. How many words start with the letter 'a' in the sentence.
Example Output: 2

Example Input: Sentence: 'a person jumping in the air while wearing skis'. How many words start with the letter 'w' in the sentence.
Example Output:
2