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 street sign against a smoggy palm tree filled sky'. How many words start with the letter 's' in the sentence.
Example Output: 4

Example Input: Sentence: 'a statue holding a red umbrella in a pond'. How many words start with the letter 's' in the sentence.
Example Output: 1

Example Input: Sentence: 'the couple is enjoying the video game with the controllers'. How many words start with the letter 'g' in the sentence.
Example Output:
1