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 kitchen with a sink and a dish rack'. How many words start with the letter 'a' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a clock tower sitting on the side of a walkway'. How many words start with the letter 't' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'the pipe extends from the rooftop overlooking the table with three chairs'. How many words start with the letter 't' in the sentence.

Ex Output:

5