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 train moves across a train crossing in a city'. How many words start with the letter 'c' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a bedroom area with bed two dressers and a window'. How many words start with the letter 'w' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'two men are walking away from the tennis court and other people are standing around'. How many words start with the letter 'a' in the sentence.

Ex Output:

5