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 pitching a baseball from a mound to a home plate'. How many words start with the letter 'a' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a baseball player gets ready to run to first base'. How many words start with the letter 't' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a man in a vintage tuxedo opens his mouth while holding a beer'. How many words start with the letter 'm' in the sentence.

Ex Output:

2


