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 woman is posing on a floor with a stuffed toy'. How many words start with the letter 'i' in the sentence.

Ex Output:
1


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 dog that is sitting by a door'. How many words start with the letter 's' in the sentence.

Ex Output:

1