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 boy in a red baseball uniform throws a ball'. How many words start with the letter 'b' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'an elephant standing in front of some trees with its trunk in the air'. How many words start with the letter 's' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a man lays on a bed and smiles to himself'. How many words start with the letter 'l' in the sentence.

Ex Output:

1