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: 'three chefs talking to each other at a bar'. How many words start with the letter 't' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a girl and her dog walk past a bike'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a street with a stoplight and google street sign'. How many words start with the letter 'a' in the sentence.

Ex Output:

3