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: 'car pass threw a green light in the day light'. How many words start with the letter 'd' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a desk with a bunch of laptop and monitors on it'. How many words start with the letter 'w' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a picture of people playing ultimate frisbee together'. How many words start with the letter 'p' in the sentence.

Ex Output:

3