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 blue bench a house and some bushes'. How many words start with the letter 'b' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'colorful flowers in a metal vase sitting on a mirror ledge'. How many words start with the letter 'c' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a brown and white dog sitting in a purple and white strip lawn chair'. How many words start with the letter 'w' in the sentence.

Ex Output:

2