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 boy standing on sand and flying a green kite'. How many words start with the letter 'f' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a girl and her dog walk past a bike'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a woman in red pajamas is hugging a cute dog'. How many words start with the letter 'r' in the sentence.

Ex Output:

1