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 door is closed with a sign on it glass cover'. How many words start with the letter 'a' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a bathroom that has a toilet and window in it'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'juvenile elephants play together in a pool at the zoo'. How many words start with the letter 't' in the sentence.

Ex Output:

2