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 busy train yard packed with trains and tracks'. How many words start with the letter 't' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'railway train passenger cars with graffiti parked on a gravel lot'. How many words start with the letter 'l' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'an office desk full of electronic equipment and paperwork'. How many words start with the letter 'e' in the sentence.

Ex Output:

2