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 woman in a black tennis outfit playing tennis on a red clay court'. How many words start with the letter 'r' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a boy in a red baseball uniform throws a ball'. How many words start with the letter 'b' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a paper towel and some fruit on a table'. How many words start with the letter 's' in the sentence.

Ex Output:

1