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 man putting a protective covering over a large tv screen'. How many words start with the letter 'l' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a skateboarder is performing a huge jump into the air'. How many words start with the letter 'p' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a train is entering a historical tunnel covered topped with greenery'. How many words start with the letter 't' in the sentence.

Ex Output:

3