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 mirror a sink a toilet  and a blue basket'. How many words start with the letter 'a' in the sentence.

Ex Output:
5


Ex Input:
Sentence: 'a beautiful young lady eating a candy apple on an amusement park ride'. How many words start with the letter 'a' in the sentence.

Ex Output:
5


Ex Input:
Sentence: 'a nice bathroom with a toilet and sink in it'. How many words start with the letter 'a' in the sentence.

Ex Output:

3