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 street sign above a faded stop sign'. How many words start with the letter 's' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'two and a half hotdogs on paper plates are on a counter'. How many words start with the letter 'p' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a vase contains flowers and branches with buds'. How many words start with the letter 'b' in the sentence.

Ex Output:

2