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 plate with potato pancakes and a fork'. How many words start with the letter 'p' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a young woman is posing on a wooden table'. How many words start with the letter 'w' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a piece of cheesecake on a dish with powdered sugar on the dish and a fruit cause over the slice of cake'. How many words start with the letter 'o' in the sentence.

Ex Output:

5