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 Input:
Sentence: 'a man sitting at a cafeteria table with his laptop and looking at his cell phone'. How many words start with the letter 'h' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a fire hydrant beside a burned building in a city'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a bike parked on top of a boat'. How many words start with the letter 'b' in the sentence.

Ex Output:

2