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 young man in a suit looks down and adjusts his tie'. How many words start with the letter 'a' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'three black bears on or around a wooden play structure'. How many words start with the letter 's' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a living room with a computer desk and a laptop'. How many words start with the letter 'l' in the sentence.

Ex Output:

2