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 person standing on a tennis court holding a tennis racket'. How many words start with the letter 'c' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a picture of a very clean bed in the room'. How many words start with the letter 'r' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a person a skateboard does a trick high in the air'. How many words start with the letter 'p' in the sentence.

Ex Output:

1