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 small bathroom has a mirror vanity and toilet'. How many words start with the letter 'b' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'two people playing frisbee on the beach on a sunny day'. How many words start with the letter 't' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'an image of a man going on the ocean waves'. How many words start with the letter 'o' in the sentence.

Ex Output:

3