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 person with a hoodie on looking at a laptop'. How many words start with the letter 'l' in the sentence.
Example Output: 2

Example Input: Sentence: 'a man is sitting on his motorcycle outside'. How many words start with the letter 'o' in the sentence.
Example Output: 2

Example Input: Sentence: 'a childrens playground slide made to look like an elephant'. How many words start with the letter 'l' in the sentence.
Example Output:
2