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 giraffe is standing behind a stone wall'. How many words start with the letter 'a' in the sentence.
2

Sentence: 'several friends are setting around a dinner table'. How many words start with the letter 's' in the sentence.
2

Sentence: 'many different types of vegetables on open display'. How many words start with the letter 'd' in the sentence.

2