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 lady has just about finished her plate with a knife'. How many words start with the letter 'a' in the sentence.
[EX A]: 3

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

[EX Q]: Sentence: 'an older man riding a horse in the mountains'. How many words start with the letter 'm' in the sentence.
[EX A]:
2