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 white sink and toilet in a wood floored bathroom'. How many words start with the letter 't' in the sentence.
Example Output: 1

Example Input: Sentence: 'a bathroom sink and mirror with someone personal belongings on it'. How many words start with the letter 'p' in the sentence.
Example Output: 1

Example Input: Sentence: 'an old rusty truck parked in greenery looks like a piece of art'. How many words start with the letter 'a' in the sentence.
Example Output:
3