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 man holding a white frisbee while standing on top of a  beach'. How many words start with the letter 'o' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'the group of people are getting ready to ski down the mountainside'. How many words start with the letter 't' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'many fruits hanging in a tree near other trees'. How many words start with the letter 'f' in the sentence.

Ex Output:

1