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 statue holding a red umbrella in a pond'. How many words start with the letter 's' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'people walking down the street while some people ride their bicycles'. How many words start with the letter 'w' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a young man attempts a skateboard trick on a sculpture'. How many words start with the letter 'a' in the sentence.

Ex Output:

4