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: 'montage color photograph of helmeted motorcycle riders and a rural fire station'. How many words start with the letter 'r' in the sentence.
Example Output: 2

Example Input: Sentence: 'a vase filled with white flowers sitting on top of a wooden table'. How many words start with the letter 't' in the sentence.
Example Output: 2

Example Input: Sentence: 'a sparsely furnished waiting area with clock table fan and chair is pictured'. How many words start with the letter 'c' in the sentence.
Example Output:
2