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: 'funny close up of a man staring cross eyed at a remote control in his mouth'. How many words start with the letter 'c' in the sentence.
Example Output: 3

Example Input: Sentence: 'a person kneeling down under a green umbrella'. How many words start with the letter 'a' in the sentence.
Example Output: 2

Example Input: Sentence: 'people in uniform on the field playing baseball'. How many words start with the letter 'o' in the sentence.
Example Output:
1