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: 'three hotdogs on a picnic table with soft drinks'. How many words start with the letter 'w' in the sentence.
Example Output: 1

Example Input: Sentence: 'a boat in a canal and a peddled bike taxi cart in snow with residences'. How many words start with the letter 'a' in the sentence.
Example Output: 4

Example Input: Sentence: 'a woman standing on a tennis court holding a racquet'. How many words start with the letter 'w' in the sentence.
Example Output:
1