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: 'cars and a motorcycle waiting at an intersection'. How many words start with the letter 'a' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'an indoor bathroom with reflective marble counter tops'. How many words start with the letter 'i' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'the black cat is sitting on the arm of the chair'. How many words start with the letter 'b' in the sentence.

Ex Output:

1