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 couple of hot dogs and napkins on a table'. How many words start with the letter 'h' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a guy a skateboard jumping in the air'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'two people walking towards the water carrying surfboards'. How many words start with the letter 'w' in the sentence.

Ex Output:

2