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 green place mat sitting on a table with a couple of plates of food and a drink placed upon it'. How many words start with the letter 'p' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a cat sitting next to boxes of produce sitting in front of a store'. How many words start with the letter 's' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a man jumping in the air on a skateboard'. How many words start with the letter 'j' in the sentence.

Ex Output:

1