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: 'young lady holding an umbrella while standing at a pond'. How many words start with the letter 'y' in the sentence.
[EX A]: 1

[EX Q]: Sentence: 'some signs buildings trees bushes a green and white sign'. How many words start with the letter 's' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'the jumbo jet flies over a building with its landing gear down'. How many words start with the letter 'a' in the sentence.
[EX A]:
1