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.

[Q]: Sentence: 'a crowd of people on the street one of which is taking pictures with a cell phone'. How many words start with the letter 'o' in the sentence.
[A]: 4


[Q]: Sentence: 'a black and white cat sits in a bathroom sink'. How many words start with the letter 'a' in the sentence.
[A]: 3


[Q]: Sentence: 'a sandwich is on a white plate near two forks and a glass of milk'. How many words start with the letter 'a' in the sentence.
[A]:
4