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 large bathroom with double sinks and a walk in shower'. How many words start with the letter 'a' in the sentence.
Example Output: 3

Example Input: Sentence: 'a living room with a computer desk and a laptop'. How many words start with the letter 'l' in the sentence.
Example Output: 2

Example Input: Sentence: 'two men sitting in front of giant pizzas'. How many words start with the letter 's' in the sentence.
Example Output:
1