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: 'three friends sit and talk while waiting for the train'. How many words start with the letter 'a' in the sentence.
[A]: 1


[Q]: Sentence: 'the men are playing tennis on the court'. How many words start with the letter 'o' in the sentence.
[A]: 1


[Q]: Sentence: 'a single zebra eating some tall grass'. How many words start with the letter 'g' in the sentence.
[A]:
1