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 young man laying on top of a white toilet seat near a sink'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a car sitting on a train carriage on the tracks'. How many words start with the letter 'a' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a modern bathroom sink and wall deco is shown'. How many words start with the letter 'w' in the sentence.

Ex Output:

1