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.

[EX Q]: Sentence: 'a close up of a dog standing on a rug'. How many words start with the letter 'o' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'a car sitting on a train carriage on the tracks'. How many words start with the letter 'a' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'a open laptop that is on sitting on top of another laptop'. How many words start with the letter 'o' in the sentence.
[EX A]:
4