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 yellow fire hydrant is placed in the grass'. How many words start with the letter 'i' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'this is an image of a group of people in a city'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a plate full of a breakfast food and a container of juice to the side'. How many words start with the letter 'a' in the sentence.

Ex Output:

4