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: 'there is a group of people with horses and a wagon'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a living room with a couch and a chair'. How many words start with the letter 'a' in the sentence.

Ex Output:

4