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 against a smoggy palm tree filled sky'. How many words start with the letter 's' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a zebra walking past a  rhino in dirt'. How many words start with the letter 'd' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a bird is drinking out of a red dish'. How many words start with the letter 'a' in the sentence.

Ex Output:

2