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 bucket of individual candy powder on a table'. How many words start with the letter 'c' in the sentence.
Example Output: 1

Example Input: Sentence: 'cars and a motorcycle waiting at an intersection'. How many words start with the letter 'a' in the sentence.
Example Output: 4

Example Input: Sentence: 'a child stands on the path under her umbrella'. How many words start with the letter 'u' in the sentence.
Example Output:
2