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 walks in the street in the rain'. How many words start with the letter 'i' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a baseball player swinging a bat while a catcher is behind him with his mitt out'. How many words start with the letter 'w' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a cat is standing in front of a tray with food'. How many words start with the letter 'a' in the sentence.

Ex Output:

2