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 group of four people are riding a ski lift as they ride over the snowy mountain'. How many words start with the letter 'a' in the sentence.
[A]: 4


[Q]: Sentence: 'dusty train passing through a dry mountain valley'. How many words start with the letter 'd' in the sentence.
[A]: 2


[Q]: Sentence: 'a man showing a young child how to fly a kite'. How many words start with the letter 'f' in the sentence.
[A]:
1