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 cat attentively watching a graphic on a television screen'. How many words start with the letter 't' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a beverage and some food are sitting on a wooden table'. How many words start with the letter 's' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a small group of giraffes standing between a fence and a building'. How many words start with the letter 'b' in the sentence.

Ex Output:

2