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: 'some very pretty giraffes standing by a big fence'. How many words start with the letter 'f' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a brown dog sitting next to a brown cat on a bed'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'soccer players playing soccer while a crowd watches in the bleachers'. How many words start with the letter 'w' in the sentence.

Ex Output:

2