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 cat inside a window looking out near another cat'. How many words start with the letter 'n' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a man skateboarding down a rail next to a building'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'small black television sitting next to a black bookcase'. How many words start with the letter 's' in the sentence.

Ex Output:

2