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: 'the bearded man is posing in a suit'. How many words start with the letter 'a' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'there is a man with a pink shirt holding two surf boards'. How many words start with the letter 'w' in the sentence.

Ex Output:

1