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 black and white cat is sitting on the bathroom sink'. How many words start with the letter 'i' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a man on a bike and a banana in the pocket'. How many words start with the letter 'a' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'some people are running toward the water at a beach'. How many words start with the letter 'a' in the sentence.

Ex Output:

3