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: 'group of zebras and gazelles grazing on the grass'. How many words start with the letter 'g' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'there is a chocolate muffin on the plate'. How many words start with the letter 'i' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'people are riding elephants in the muddy water'. How many words start with the letter 'r' in the sentence.

Ex Output:

1