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 picture of a zebra that is walking in the grass'. How many words start with the letter 'z' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a professional baseball player holding a baseball bat'. How many words start with the letter 'p' in the sentence.

Ex Output:

2