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: 'ostrich in enclosed area next to a giraffe'. How many words start with the letter 't' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a baseball player prepares to swing at a pitch'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a cyclist pedals past a flock of birds perched on a grating'. How many words start with the letter 'b' in the sentence.

Ex Output:

1