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 couple of people that are playing wii'. How many words start with the letter 'p' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a bed sitting next to a window with a wooden headboard'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a large bird is screeching at another bird'. How many words start with the letter 'a' in the sentence.

Ex Output:

3