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 sink toilet and trashcan in a bathroom'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a womans face next to an oven cooking food'. How many words start with the letter 'f' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a person swinging a tennis racket hitting a tennis ball'. How many words start with the letter 'a' in the sentence.

Ex Output:

3