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 sitting on a bicycle rickshaw talking on the phone'. How many words start with the letter 's' in the sentence.
[EX A]: 1

[EX Q]: Sentence: 'a bathroom mirror reflecting a sink and bathtub'. How many words start with the letter 'a' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'a person riding a horse with trees in the background'. How many words start with the letter 't' in the sentence.
[EX A]:
2