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.

Q: Sentence: 'this is a park with people flying kites'. How many words start with the letter 'p' in the sentence.

A: 2
****
Q: Sentence: 'an older airplane flies over the country side'. How many words start with the letter 'o' in the sentence.

A: 2
****
Q: Sentence: 'two birds sitting on a tree stump side by side'. How many words start with the letter 's' in the sentence.

A:
4
****