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: 'three chefs talking to each other at a bar'. How many words start with the letter 't' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a person on a court with a tennis racket'. How many words start with the letter 'p' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a man kneeling down in the snow next to his small son on skis'. How many words start with the letter 's' in the sentence.

Ex Output:

4