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 woman is picking a black cat up off of the floor'. How many words start with the letter 'a' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a man using a laptop computer on a table'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a dimly lit kitchen with many modern appliances'. How many words start with the letter 'w' in the sentence.

Ex Output:

1