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 with glasses on her head with a french fry in her mouth'. How many words start with the letter 'h' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a group of four skiers are getting ready to embark'. How many words start with the letter 'g' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a base ball player is striking the bat at the base ball in a game'. How many words start with the letter 's' in the sentence.

Ex Output:

1