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 man is carrying a large case with him'. How many words start with the letter 'w' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a man in vest and tie holding a cellphone'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a white cat is approaching a black bird'. How many words start with the letter 'a' in the sentence.

Ex Output:

3