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: 'older kitchen in need of repair and drinkable water'. How many words start with the letter 'k' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a person on skis goes across a snowy slope'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'cars drive down the street on a dark stormy day'. How many words start with the letter 's' in the sentence.

Ex Output:

2