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 grey cat starring at a hand with a donut'. How many words start with the letter 'a' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a street sign view in a very blurry picture'. How many words start with the letter 's' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'two parking meters stand side by side on a street'. How many words start with the letter 'b' in the sentence.

Ex Output:

1