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

Sentence: 'a giraffe and two small hogs stand in an enclosure'. How many words start with the letter 's' in the sentence.
2

Sentence: 'the gray parrot is having a snack on the table'. How many words start with the letter 't' in the sentence.

3