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 giraffe and two small hogs stand in an enclosure'. How many words start with the letter 's' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a girl who is wearing a back pack with a teddy bear in it'. How many words start with the letter 'w' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a woman holding a nearly bald baby in her left arm'. How many words start with the letter 'a' in the sentence.

Ex Output:

3