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 boat floating on a lake next to a shore filled with buildings'. How many words start with the letter 'n' in the sentence.
1

Sentence: 'a medium sized dog playing with a frisbee'. How many words start with the letter 'a' in the sentence.

2