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 train passes over a quiet city park on a bridge'. How many words start with the letter 'a' in the sentence.

A: 3
****
Q: Sentence: 'a dog on one side of a glass door and a cat on the other side'. How many words start with the letter 'a' in the sentence.

A: 4
****
Q: Sentence: 'a small child in a blue shirt with a float board in some water'. How many words start with the letter 's' in the sentence.

A:
3
****