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 vase filled with white flowers sitting on top of a wooden table'. How many words start with the letter 't' in the sentence.
Example Output: 2

Example Input: Sentence: 'a black and white picture of a young couple on a subway'. How many words start with the letter 's' in the sentence.
Example Output:
1