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 woman is holding the hand of a boy who is leaning on a fire hydrant'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a woman is standing in the kitchen using her phone'. How many words start with the letter 'w' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a woman is helping a man cross a stream'. How many words start with the letter 'c' in the sentence.

Ex Output:

1