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 group of young people riding snow boards down a snow covered hillside'. How many words start with the letter 'a' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'a green fire hydrant is in the middle of an open dirt hole in a construction area'. How many words start with the letter 'a' in the sentence.
[EX A]: 4

[EX Q]: Sentence: 'a man is looking up while another man is peeking over his shoulder'. How many words start with the letter 'm' in the sentence.
[EX A]:
2