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.

Sentence: 'a train passes over a quiet city park on a bridge'. How many words start with the letter 'a' in the sentence.
3

Sentence: 'a woman in a black tennis outfit playing tennis on a red clay court'. How many words start with the letter 'r' in the sentence.
1

Sentence: 'one man is on the couch and another man is holding something up'. How many words start with the letter 'i' in the sentence.

2