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 people standing around an airplane on top of a field'. How many words start with the letter 'a' in the sentence.
5

Sentence: 'a person sitting on a stone wall using a cellular phone'. How many words start with the letter 's' in the sentence.
2

Sentence: 'a close view of a cat through a magnifying glass'. How many words start with the letter 'c' in the sentence.

2