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 covers his ears with his hands as he stands outside a store'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a lady playing a game of tennis on a green and blue court'. How many words start with the letter 'l' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a group of men preparing food inside of a kitchen'. How many words start with the letter 'a' in the sentence.

Ex Output:

2