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 laptop and some computers on a desk'. How many words start with the letter 'd' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'the man is standing on a surfboard with a paddle'. How many words start with the letter 's' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a red parking sign in an alley with tall buildings'. How many words start with the letter 'r' in the sentence.

Ex Output:

1