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 man and three children playing with a kite on the grass and other people riding bikes on a nearby road'. How many words start with the letter 'a' in the sentence.
[EX A]: 5

[EX Q]: Sentence: 'there is a very large table with many foods and people sitting at it'. How many words start with the letter 'a' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'a sign post on a cobblestone street with several signs attached'. How many words start with the letter 's' in the sentence.
[EX A]:
4