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 door is closed with a sign on it glass cover'. How many words start with the letter 'a' in the sentence.
2

Sentence: 'a group of four skiers are getting ready to embark'. How many words start with the letter 'g' in the sentence.
2

Sentence: 'three girls holding pompoms on top of a samsung bus'. How many words start with the letter 't' in the sentence.

2