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.

[EX Q]: Sentence: 'an elephant standing in front of some trees with its trunk in the air'. How many words start with the letter 's' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'someone flying a red kite in a crowded park'. How many words start with the letter 'a' in the sentence.
[EX A]: 2

[EX Q]: Sentence: 'a dog walking and a man riding a motorized scooter on sand'. How many words start with the letter 'o' in the sentence.
[EX A]:
1