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 woman is posing on a floor with a stuffed toy'. How many words start with the letter 'i' in the sentence.
Example Output: 1

Example Input: Sentence: 'a man standing outdoors next to a dirt bike and atv'. How many words start with the letter 't' in the sentence.
Example Output: 1

Example Input: Sentence: 'a man in a wheel chair holding a tennis racquet'. How many words start with the letter 't' in the sentence.
Example Output:
1