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 group of people sitting at a long table in  a wine cellar'. How many words start with the letter 'a' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a bus and two cars are going down a two way street'. How many words start with the letter 't' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a baseball player is in full extension to unleash the ball'. How many words start with the letter 't' in the sentence.

Ex Output:

2