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 man with baseball gear on holding a bat in his hands'. How many words start with the letter 'a' in the sentence.
Example Output: 2

Example Input: Sentence: 'dusty train passing through a dry mountain valley'. How many words start with the letter 'd' in the sentence.
Example Output: 2

Example Input: Sentence: 'an orange train is seen on the tracks in this photo'. How many words start with the letter 't' in the sentence.
Example Output:
4