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: 'the woman is on the court playing a game of tennis'. How many words start with the letter 'i' in the sentence.
Example Output: 1

Example Input: Sentence: 'a man holding onto a kite for a woman in the yard'. How many words start with the letter 'o' in the sentence.
Example Output: 1

Example Input: Sentence: 'a train traveling down the rail road tracks near tall grass'. How many words start with the letter 't' in the sentence.
Example Output:
5