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: 'a man in red and black jacket snowboarding on slope'. How many words start with the letter 'o' in the sentence.
[EX A]: 1

[EX Q]: Sentence: 'a couple of people are riding horses in a village'. How many words start with the letter 'a' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'a clock tower atop a tall building with a lighting rod'. How many words start with the letter 'a' in the sentence.
[EX A]:
4